pennsylvania potato research report, 2011 potato research report 2011.pdffor control of potato late...
TRANSCRIPT
Pennsylvania Potato Research Report, 2011
Edited by:
Barbara J. Christ
&
Xinshun Qu
Department of Plant Pathology
The Pennsylvania State University
University Park, PA 16802
January 3, 2012
TABLE OF CONTENTS
TITLE PAGE
Executive Summary ...................................................................................................
i
Progress Report - Pennsylvania Regional Potato Germplasm Evaluation Program ..
1
Yield and Harvest Data Tables ..................................................................................
3
Management of Evaluation Trials ..............................................................................
28
Evaluation of potato cultivars and breeding lines for resistance to late blight ..........
29
Evaluation of potato cultivars and breeding lines for resistance to early blight ........
30
Evaluation of potato cultivars and breeding lines for resistance to powdery scab ....
31
Evaluation of fungicides for control of potato late blight .....................................................
32
Evaluation of fungicides for control of potato early blight ........................................
33
i
EXECUTIVE SUMMARY
Penn State’s Department of Plant Pathology potato research program can be categorized into five areas: 1)
variety breeding and evaluation, 2) breeding for disease resistance (focused on early and late blight and
powdery scab), 3) biology and genetic variability of potato pathogens (focused on early and late blight and
powdery scab), 4) chemical control and 5) integrated pest management of potatoes. Many of these projects are
long term and only yearly results are presented here.
1. Variety Breeding and Evaluation
At the Rock Springs location the trials included 65 round whites with a few yellow flesh, 37 red-skinned (a
few purple skinned) and 23 russet or long white types. The Northampton location had 39 lines and 41
specialty lines. Breeding lines were contributed by the USDA-ARS, New York, Maine, Michigan, Colorado,
North Carolina, Oregon, Idaho and a few other sources. See Pennsylvania Regional Potato Germplasm
Evaluation Program, 2011 on pages 1-2, and tables from different locations on pages 3-28.
2. Breeding for Disease Resistance
There are several projects focused around a cultivated diploid species hybrid population that can be easily
intercrossed with common varieties. These are long term projects dealing with early and late blight resistance
as well as powdery scab resistance. Results of these projects will not be presented here but results of small
trials evaluating soon to be released lines for their reaction to early blight, late blight and powdery scab are
presented. In three separate field trials, 73, 37 and 38 varieties and advanced breeding lines were evaluated for
disease resistance to late blight, early blight, and powdery scab, respectively.
Kennebec was considered the moderately resistant check and B0718-3 was the resistant check to late blight.
Yukon Gem, AF3317-15, AF2574-1, Classic Russet, NY145, NYE106-4, Alpine Russet, Joma, Rio Grande
Russet, Snowden, Premier Russet, Russet Burbank, AWN86514-2, MSQ176-5, AF3317-15, B0692-4,
A00286-3Y, AF4191-2, AF4122-3, MSR061-1, and AC99375-1RU were resistant to moderately resistant.
See Evaluation of potato cultivars and breeding lines for resistance to late blight, 2011 page 29.
Twelve cultivars/lines were classified as moderately resistant to early blight, and they included: Premier
Russet, Russet Burbank, AF3317-15, BNC182-5, AF3001-6, NYE106-4, B1992-106, Alpine Russet, Rio
Grande Russet, Kennebec, Snowden, and Yukon Gem. See Evaluation of potato cultivars and breeding
lines for resistance to early blight, 2011 page 30.
Powdery scab disease pressure was very low this year thus making it difficult to separate cultivars/lines into
groups (resistant, moderately resistant, moderately susceptible, and susceptible). Based on our past years’
data, Kennebec and Shepody should be susceptible, and RioGrande Russet, Russet Norkotah and Russet
Burbank should be moderately resistant. Cultivars and breeding lines with less powdery scab than Dark Red
Norland indicate some level of resistance. See Evaluation of potato cultivars and breeding lines for
resistance to powdery scab, 2011 page 31.
3. Chemical Control of Potato Diseases
In the late blight fungicide trial 10 different treatments were compared to an untreated control. All of the
treatments significantly suppressed season-long foliar late blight compared to the untreated control.
Treatments with Bravo Weather Stik, Gavel, GWN-4700 + GWN-9941, GWN-4700 + GWN-9938 and Bravo
Weather Stik alternated with Zampro had the lowest levels of foliar late blight. See Evaluation of fungicides
for control of potato late blight, 2011 pages 32.
In the early blight fungicide trial 11 different treatments were compared to an untreated control. All treatments
significantly reduced season-long early blight compared to the untreated control, except for CX-10440 at the
rate of 3.75 oz/A. See Evaluation of fungicides for control of potato early blight, 2011 pages 33.
1
Progress Report—December 16, 2011
Pennsylvania Regional Potato Germplasm Evaluation Program, 2011
Barbara J. Christ, Xinshun Qu, and Michael PeckDepartment of Plant PathologyThe Pennsylvania State University
The objective of this project is to find new breeding lines that have adaptation to Pennsylvania potatogrowing regions, and have qualities that are suitable for either processing or tablestock use. Wecooperate with the project leaders of several other potato breeding programs from the Northeast USand a few programs from the Midwest US and Canada by evaluating their potato germplasm. Datafrom this project helps breeders determine which lines to focus on for potential release as newvarieties and also allows you to focus on very specific lines that may be released in the near future.
Replicated and non-replicated plots were established at the following locations: Northampton Co.(Tables 1-3), and Rock Springs, Centre Co. (Tables 4-15). The Northampton location had 23 lineswith three replications, 16 lines non-replicated and 41 non-replicate specialty lines. At the RockSprings location the germplasm trials included 65 round whites with a few yellow flesh, 37 red-skinned (a few purple skinned) and 23 russet or long white types in replicated plots. The seedspacing was 8-inch within a 10-ft plot except for the russets that were at 10-inch. At the RockSprings location we also had an early season trial with 44 non-replicate lines which had 90 growthdays, and a spacing trial with 28 non-replicate lines in which the seed spacing was 12-inch within a15-ft plot. All other pertinent information for individual trials is found within the data tables or inTable 16. We assessed yield and external defects, skin color, texture, tuber shape, specific gravityand overall appearance. Chip quality tests and culinary tests will be conducted over the next fewmonths. This spring was wet followed by hot temperatures in July and wet conditions in Septemberand October across the state for most of the growing season. Management information for each siteis provided in Table 16.
To interpret this data, one needs to know the yields for the check cultivars such as Atlantic,Snowden, Katahdin, Chieftain, Dark Red Norland, Russet Norkotah or Superior on your farm. Thencompare the typical yield for this year on your farm to the data presented here. The yields tend to beinflated from these small plots but the ranking of the yields over the cultivars/lines usually is fairlyconsistent. Also the same method can be used to compare specific gravity and some of the otherparameters. There are a few lines that will be very specific to certain environments so make thecomparison to the location that best matches your own or use the Rock Springs location as a fairlytypical area for most of PA.
Results:
Across the two locations there were only a few varieties and lines in common. Of those in commonthe following had high yields relative to Atlantic yield in each of the locations. These varieties orlines were: Snowden, NY140, and BNC182-5.
2
In the Northampton location the following lines also had high yield: Reba, Yukon Gold, NY149,AF4013-3, ATCO0293-1w/y, Sifra, Lehigh, Joma, and Smart.
Based on data of replicated trials at Rock Springs, there were another 12 round white clones withmarketable yields greater than Atlantic. However, any clone with marketable yield between 292-474cwt is not statistically different than yield of Atlantic.
Round White Chip-stock:Based on data from replicated trials at Rock Springs, the following lines had higher yields thanAtlantic and have specific gravities suitable for chipstock: Snowden, AF0338-17, BNC182-5,NY138, NYE106-4, and H15-6.
Round White Tablestock:Based on data from replicated trials at Rock Springs, the following lines had higher yields thanAtlantic and had specific gravities suitable for tablestock: AF2866-3, B2738-3, NY140, G4-2, G73-1, and H15-5.
Red-skinned:Based on data of replicated trials at Rock Springs, there were 3 red-skinned or purple-skinned cloneswith marketable yields significantly greater than Chieftain: NY144, NYB13-1 and NDA7985-1R;there were another 16 red-skinned or purple-skinned clones with marketable yields greater thanChieftain. Any clone with marketable yield between 186-378cwt is not statistically different from theyield of Chieftain.
Russet-skinned or long white:Based on data of replicated trials at Rock Springs, there were 2 russet-skinned clones withmarketable yields greater than Russet Norkotah #3117: Classic Russet (A95109-1) and AF3362-1.Any clone with marketable yield between 209-361cwt is not statistically different from the yield ofRusset Norkotah #3117.
The Pennsylvania Potato Research Program and a USDA grant funded this research in conjunction with donations. This researchis the result of cooperation of growers, industry and PSU staff. The growers hosting the plots provided contributions (land,fertilizer, pesticides, time, etc.). Many of the pesticides used at Rock Springs location were donations from numerous chemicalcompanies. The New York, USDA, Maine, Oregon, Idaho, Colorado, Michigan and Canada breeding programs provided seed.Special thanks to Chad Moore, Bob Leiby, and Andy Muza who made sure this project was completed.
3
%%
Tot
al>1
7/8
"U
S#1
of S
tand
ard2
23
45
Atla
ntic
443
395
8910
021
4521
28
1.08
5Sn
owde
n44
140
591
103
2653
120
61.
079
Reb
a46
544
696
113
3049
170
31.
071
Chi
efta
in54
346
686
118
2245
190
111.
061
Yuk
on G
oldyf
437
402
9210
219
4825
06
1.07
4Su
perio
r42
438
791
982 4
589
07
1.06
6N
Y13
8 (W
anet
a)41
338
894
9822
4725
03
1.07
1N
Y13
9 (L
amok
a)39
634
888
8834
477
06
1.07
6N
Y14
047
542
088
106
2153
150
81.
077
NY
141
388
338
8786
2347
170
81.
071
NY
144
500
364
7392
5220
10
91.
048
NY
149
(F11
-1)yf
472
406
8510
359
261
01
1.06
9B
13-1
187
140
7535
5 020
50
91.
048
AF4
013-
3yf48
142
889
108
3250
70
71.
075
AF4
222-
437
534
091
8618
5615
27
1.07
3B
1992
-106
310
277
9070
3547
80
41.
073
B21
52-1
7yf49
540
080
101
4930
10
41.
068
B27
27-2
331
311
9479
4843
30
11.
085
B27
51-1
yf34
826
476
6735
355
016
1.07
6A
TC
O02
93-1
w/y
yf54
640
173
102
3236
60
191.
061
Sylv
anayf
454
395
8710
034
459
010
1.06
0Si
fra
542
439
8111
135
433
011
1.06
4P
assi
onyf
501
328
6583
4521
00
161.
052
Rus
set N
orko
tah*
460
339
7486
2 430
190
241.
069
AF3
011-
34*
344
306
8978
4 419
260
61.
073
Gol
dfin
ger*
yf42
021
250
5439
120
027
1.07
1A
9834
5-1*
309
222
7256
2233
170
261.
074
Leh
igh*
498
480
9612
21 0
4337
63
1.07
2Jo
ma*
620
464
7511
814
2733
024
1.07
1
Tab
le 1
. Tot
al y
ield
, gre
ater
than
1 7
/8"
yiel
d, p
erce
nt o
f sta
ndar
d, s
ize
dist
ribut
ion,
per
cent
pic
k ou
ts a
nd s
peci
fic g
ravi
ty fo
r pot
ato
eval
uatio
n tr
ial i
n N
orth
ampt
on C
ount
y, G
arry
Hun
sick
ers
Farm
, 201
1
Var
iety
/Lin
eY
ield
(cw
t/A
)1%
by
size
cla
ss3
%PO
4Sp
ecifi
c G
ravi
ty
4
%%
Tot
al>1
7/8
"U
S#1
of S
tand
ard2
23
45
Kat
ahdi
n*34
432
594
8225
628
03
1.06
3B
NC
182-
5*54
951
594
131
2461
90
41.
083
H4-
1*45
738
083
9647
360
06
1.06
6M
SN10
5-1*
306
277
9070
4134
150
31.
081
Smar
t*yf
632
495
7812
560
153
011
1.06
7
Dk
Rd
Nor
land
*47
838
981
9924
526
015
1.06
3N
DA
7985
-1R
*46
038
985
9910
4529
014
1.05
5C
O99
076-
6R*
339
293
8674
2257
70
111.
062
BN
C20
1-1*
474
404
8510
223
539
09
1.07
7B
2676
-2*
316
288
9173
4640
40
31.
078
LSD
107
101
69
1210
26
3 Perc
enta
ge o
f tot
al y
ield
acc
ordi
ng to
siz
e cl
ass.
2=
1.87
5-2.
5 in
., 3=
2.5-
3.25
in.,
4=3.
25-4
.0 in
., 5=
>4.0
in.
Rep
licat
ed tr
ials
are
the
aver
age
of 3
repl
icat
es e
xcep
t for
thos
e lin
es w
ith *
whi
ch w
ere
non-
repl
icat
ed.
LSD
indi
cate
s le
ast s
igni
fican
t diff
eren
ce (P
= 0
.05)
, cal
cula
ted
for r
eplic
ated
var
ietie
s on
ly.
Var
ietie
s w
ith c
olor
ed fl
esh
are
indi
cate
d by
yf fo
r yel
low
. R
usse
ts w
ere
plan
ted
10-in
. apa
rt w
ith 1
2 se
ed p
iece
s pe
r 10-
ft p
lot,
all o
ther
var
ietie
s w
ere
spac
ed 8
-in. a
part
with
15
seed
pie
ces
per 1
0-ft
plo
t. Spec
ific
Gra
vity
Var
iety
/Lin
eY
ield
(cw
t/A
)1%
by
size
cla
ss3
1 Yie
ld T
otal
= a
ll yi
eld
incl
udin
g pi
ckou
ts.
Yie
ld >
1 7/
8" =
cat
egor
ies
2, 3
, 4 a
nd 5
exc
ludi
ng p
icko
uts.
2 Perc
enta
ge o
f the
sta
ndar
d, A
tlant
ic, f
or >
1 7/
8" y
ield
.
4 Perc
enta
ge o
f tot
al th
at a
re p
icko
uts.
%PO
4
5
TA
CT
XSh
TED
TC
SH
HIB
Atla
ntic
55
52
45
10
Gre
enSn
owde
n4
55
25
61
0G
reen
Reb
a5
66
35
50
0G
reen
Chi
efta
in4
27
25
50
02n
d tu
bers
, Gre
en
Yuk
on G
oldyf
57
72
65
00
Gre
enSu
perio
r4
66
64
40
0M
issh
apen
NY
138
(Wan
eta)
66
72
65
10
Gre
enN
Y13
9 (L
amok
a)5
67
25
60
0G
reen
NY
140
56
63
65
10
Gre
enN
Y14
15
77
26
50
0G
reen
NY
144
42
82
66
00
Gre
en, S
pout
s
NY
149
(F11
-1)yf
66
72
75
00
Spou
tsB
13-1
42
73
75
00
Mis
shap
en, G
reen
AF4
013-
3yf5
77
35
50
0G
reen
, Spr
outs
AF4
222-
45
67
27
60
0G
reen
B19
92-1
065
55
37
60
0G
reen
B21
52-1
7yf
62
72
75
00
Gre
en
B27
27-2
57
63
55
00
Gre
en
B27
51-1
yf
56
62
56
00
Gre
en, G
row
th c
rack
s
AT
CO
0293
-1w
/yyf
56
73
56
10
Spou
ts, 2
nd tu
bers
, Gre
en
Sylv
anayf
56
62
55
00
Kno
bs, G
reen
Sifr
a4
77
26
60
02n
d tu
bers
, Gre
en
Pass
iony
f4
26
37
60
0M
issh
apen
, Gre
enR
usse
t Nor
kota
h*5
43
46
50
0M
issh
apen
, Gre
enA
F301
1-34
*6
64
46
50
0M
issh
apen
, Gre
en
Gol
dfin
ger*
yf5
77
46
50
0M
issh
apen
, Gre
enA
9834
5-1*
56
64
65
30
Mis
shap
en
Lehi
gh*
56
63
55
10
Gre
en
Jom
a*4
77
45
50
0G
reen
, Gro
wth
cra
cks
Tab
le 2
. Tub
er c
hara
cter
istic
s, in
tern
al a
nd e
xter
nal d
efec
ts fo
r pot
ato
eval
uatio
n tr
ial
in N
orth
ampt
on C
ount
y, G
arry
Hun
sick
ers
Farm
, 201
1
Var
iety
/Lin
eT
uber
Cha
ract
eris
tics1
Inte
rnal
Def
ects
2
Res
ons
for P
icko
uts
6
TA
CT
XSh
TED
TC
SH
HIB
Kat
ahdi
n*5
77
36
60
0G
reen
BN
C18
2-5*
56
52
56
00
Gre
en
H4-
1*5
76
24
61
0G
reen
MSN
105-
1*4
77
25
50
0G
reen
Smar
t*yf
47
73
65
00
Gre
enD
k R
d N
orla
nd*
42
83
55
00
Gro
wth
cra
cks,
Gre
enN
DA
7985
-1R
*6
28
34
50
0G
reen
CO
9907
6-6R
*5
28
26
60
0G
reen
BN
C20
1-1*
52
72
46
00
Gre
enB
2676
-2*
62
73
75
00
Gre
en
2 Inte
rnal
Def
ects
: HH
= h
ollo
w h
eart
, IB
= in
tern
al b
row
ning
. T
otal
num
ber o
bser
ved
out o
f 12
tube
rs fo
r rep
licat
ed tr
ials
and
tota
l num
ber
out o
f 4 fo
r non
repl
icat
ed tr
ials
(mar
ked
with
*).
0 =
not
obs
erve
d.
Res
ons
for P
icko
uts
T
X =
ski
n te
xtur
e: 1
= p
arti
al r
usse
t, 2
= h
eavy
rus
set,
3 =
mod
. rus
set,
4 =
ligh
t ru
sset
, 5 =
net
ted,
6 =
slig
ht n
et, 7
= m
od. s
moo
th, 8
= s
moo
th, 9
=
very
sm
ooth
.
Sh =
tub
er s
hap
e: 1
= r
ound
, 2 =
mos
tly
rou
nd, 3
= r
ound
-obl
ong,
4 =
mos
tly
obl
ong,
5 =
obl
ong,
6 =
obl
ong-
long
, 7 =
mos
tly
long
, 8 =
long
, 9 =
cy
lindr
ical
.
Var
iety
/Lin
eT
uber
Cha
ract
eris
tics1
Inte
rnal
Def
ects
2
1 Tub
er C
hara
cter
istic
s: T
A =
tube
r app
eara
nce:
1 =
ver
y po
or, 5
= fa
ir, 9
= e
xcel
lent
.
C =
ski
n co
lor:
1 =
purp
le, 2
= re
d, 3
= p
ink,
4 =
dar
k br
own,
5 =
bro
wn,
6 =
tan,
7 =
buf
f, 8
= w
hite
, 9 =
cre
am.
TED
= tu
ber e
ye d
epth
: 1 =
ver
y de
ep, 5
= m
ediu
m, 9
= v
ery
shal
low
. TC
S =
tube
r cro
ss s
ectio
n: 1
= v
ery
flat,
5 =
inte
rmed
iate
, 9 =
ver
y
7
%%
V
ine
To
tal
>1
7/8"
US
#1
of
Sta
nd
ard
22
34
5M
atu
rity
Dar
k R
ed N
orl
and
142
119
8410
018
660
0E
Yu
kon
Go
ld19
318
496
155
3154
100
ME
Reb
a23
021
593
180
4647
00
MS
up
erio
r16
414
589
121
5435
00
EA
dir
on
dac
k R
ed23
716
369
136
690
00
ER
ed s
kin
, red
fle
shA
dir
on
dac
k B
lue
276
260
9421
871
240
0M
EP
urp
le s
kin
, pu
rple
fle
shG
1-11
195
3619
3119
00
0M
EO
blo
ng
wh
ite
tub
ers
wit
h p
ink
eyes
, yel
low
fle
shH
52-1
248
198
8016
656
195
0M
LP
urp
le s
kin
, pu
rple
fle
shH
63-1
233
207
8917
378
110
0M
Ro
un
d w
hit
e, y
ello
w f
lesh
, pin
k ey
esH
85-2
191
157
8213
279
30
0M
EP
urp
le s
pla
sh s
kin
, yel
low
fle
shH
91-1
324
292
9024
545
450
0M
LP
urp
le s
kin
wit
h w
hit
e sp
lash
, yel
low
fle
shH
122-
420
920
699
173
6039
00
ML
Pin
k sk
in, w
hit
e fl
esh
Bla
ckb
erry
157
134
8611
250
360
0M
EP
urp
le s
kin
, pu
rple
fle
shR
asp
ber
ry22
317
779
148
728
00
ME
Red
ski
n, r
ed f
lesh
Co
lon
ial P
urp
le24
021
288
178
4840
00
MP
urp
le s
kin
, wh
ite
fles
hM
SQ
432-
2PP
8160
7551
5322
00
MP
urp
le s
kin
, pu
rple
an
d y
ello
w f
lesh
Sp
arta
n S
pla
sh20
517
083
142
6320
00
MW
hit
e sk
in w
ith
pu
rple
sp
lash
, yel
low
fle
shB
2152
-17
228
169
7414
270
40
0E
Red
ski
n, y
ello
w f
lesh
BC
O01
044-
220
519
193
160
2865
00
ML
Pu
rple
ski
n, p
uu
rple
fle
shB
CO
0130
6-2
175
149
8512
573
120
0M
LR
ed s
kin
, red
fle
shB
NC
201-
122
319
386
162
5130
50
MR
ed s
kin
, yel
low
fle
shB
2756
-710
974
6962
4622
00
ME
Red
ski
n, y
ello
w f
lesh
BN
C24
3-1
275
181
6615
256
100
0M
LR
ed s
kin
AC
9752
1-1R
/Y27
721
878
182
709
00
ML
Red
ski
n, y
ello
w f
lesh
CO
9722
2-1R
251
178
7114
963
80
0M
Red
ski
n, r
ed f
lesh
Pu
rple
Maj
sety
245
121
4910
149
00
0M
LP
urp
le s
kin
, pu
rple
fle
shN
DA
7985
-1R
356
322
9026
933
534
0L
Red
ski
n, w
hit
e fl
esh
A99
331-
2RY
251
175
7014
765
50
0L
Red
ski
n, y
ello
w f
lesh
Go
ldfi
ng
er27
412
746
106
460
00
ML
Ob
lon
g t
ub
ers,
yel
low
fle
shP
assi
on
274
208
7617
558
180
0M
LR
ed s
kin
, yel
low
fle
shR
od
eo23
320
086
168
7511
00
LR
ed s
kin
, yel
low
fle
shS
mar
t34
728
281
236
774
00
MW
hit
e sk
in, y
ello
w f
lesh
Sn
ow
bir
d22
619
586
163
5036
00
MW
hit
e sk
inL
ehig
h30
529
396
245
1676
40
ML
Ch
ieft
ain
332
322
9726
937
4614
0M
LK
atah
din
209
198
9516
630
4915
0L
Pet
er W
ilco
x20
516
581
138
7010
00
ML
Pu
rple
ski
n, y
ello
w f
lesh
3P
erce
nta
ge
of
tota
l yie
ld a
cco
rdin
g t
o s
ize
clas
s.
2=1.
875-
2.5
in.,
3=2.
5-3.
25 in
., 4=
3.25
-4.0
in.,
5=>
4.0
in.
Tab
le 3
. To
tal y
ield
, gre
ater
th
an 1
7/8
" y
ield
, per
cen
t o
f st
and
ard
, siz
e d
istr
ibu
tio
n, p
erce
nt
pic
k o
uts
an
d s
pec
ific
gra
vit
y f
or
spec
ialt
y p
ota
to e
val
uat
ion
tr
ial i
n N
ort
ham
pto
n C
ou
nty
, Gar
ry H
un
sick
ers
Far
m, 2
011
2P
erce
nta
ge
of
the
stan
dar
d, D
ark
Red
No
rlan
d, f
or
>1
7/8"
yie
ld.
No
tes
Var
iety
/Lin
eY
ield
(cw
t/A
)1%
by
siz
e cl
ass3
1Y
ield
To
tal =
all
yie
ld in
clu
din
g p
icko
uts
. Y
ield
>1
7/8"
= c
ateg
ori
es 2
, 3, 4
an
d 5
.
8
%S
pec
ific
To
tal
>1
7/8"
US
#1
23
45
Gra
vit
yA
tlan
tic
427
383
9010
013
4926
18
1.07
8
JOM
A48
827
656
7212
2817
042
1.06
9
Kat
ahd
in32
828
187
7315
5022
012
1.06
2
Ken
neb
ec45
823
251
6010
2516
047
1.06
4S
no
wd
en44
642
796
111
3847
100
31.
077
Su
per
ior
402
347
8791
2251
140
81.
064
Yu
kon
Gem
yf
466
343
7590
2237
160
221.
062
Yu
kon
Go
ldy
f35
929
282
7613
3633
016
1.06
9A
F25
74-1
500
318
6483
1739
80
331.
070
AF
2866
-347
341
788
109
2442
210
71.
057
AF
4047
-240
630
475
7917
3919
021
1.05
9A
F03
38-1
748
439
781
104
1631
340
151.
075
B19
92-1
0633
628
885
7524
4912
011
1.06
5
BN
C18
2-5
467
413
8810
824
4617
06
1.07
9N
Y13
8 (W
anet
a)44
339
489
103
938
420
91.
072
NY
139
(Lam
oka
)36
631
987
8330
4116
010
1.07
1N
Y14
3 (N
YB
38-4
0)27
022
686
5937
3316
09
1.05
6N
Y14
5 (N
YD
40-3
5)33
127
783
7249
290
52
1.07
6N
YE
106-
447
943
491
113
2146
230
51.
077
AF
4013
-3y
f44
336
582
9532
438
09
1.07
4A
F41
25-1
355
327
9285
2355
140
71.
069
AF
4130
-741
829
771
7718
449
024
1.07
9
AF
4157
-641
236
188
9435
484
08
1.07
5A
F42
22-4
323
304
9379
1634
430
51.
068
BN
C20
2-3y
f38
926
569
6913
4611
025
1.07
3
BN
C20
2-7y
f38
231
583
8234
418
010
1.08
0B
2727
-232
027
285
7135
447
010
1.08
1B
2731
-11
339
264
7769
1650
120
201.
072
B27
38-3
493
456
9311
918
4926
03
1.05
8
B27
81-3
yf
480
348
7391
2045
80
221.
073
Leh
igh
yf
430
359
8494
1639
280
141.
071
Reb
a38
733
286
8716
4922
011
1.06
2
Tab
le 4
. To
tal y
ield
, gre
ater
th
an 1
7/8
" y
ield
, per
cen
t o
f st
and
ard
, siz
e d
istr
ibu
tio
n, p
erce
nt
pic
kou
ts, a
nd
sp
ecif
ic g
rav
ity
fo
r ro
un
d w
hit
e p
ota
to e
val
uat
ion
tri
al in
Ro
ck S
pri
ng
s, P
lan
t P
ath
olo
gy
Far
m, 2
011
Var
iety
/Lin
eY
ield
(cw
t/A
)1%
of
Sta
nd
ard
2%
by
siz
e cl
ass3
%P
O4
9
%S
pec
ific
To
tal
>1
7/8"
US
#1
23
45
Gra
vit
yN
Y14
045
141
692
109
1645
300
71.
066
NY
141
454
367
8096
1344
240
171.
069
NY
149y
f41
732
778
8543
286
012
1.06
8G
1-11
294
6020
1617
30
053
1.05
5
G4-
260
340
668
106
3724
70
211.
058
G20
-31
354
324
9185
3948
40
41.
068
G20
-41
374
313
8482
3542
70
121.
075
G73
-154
745
082
117
1233
362
151.
056
G87
-329
528
395
7433
594
02
1.07
7H
4-1
244
202
8253
5824
00
81.
063
H6-
348
329
862
7840
211
028
1.07
1H
15-5
481
407
8410
647
370
09
1.06
9H
15-6
454
392
8610
229
498
09
1.07
5H
15-9
349
291
8476
2046
170
111.
066
H15
-17
399
350
8791
1949
190
111.
057
H23
-16
226
190
8249
2544
140
71.
076
H25
-235
931
387
8242
396
06
1.08
0H
25-4
358
282
7973
2344
92
171.
074
H25
-537
532
486
8422
5212
08
1.07
4H
63-1
373
344
9290
2458
100
41.
079
MS
L21
1-3
348
275
7872
2045
122
181.
063
MS
J126
-9Y
yf
315
296
9477
4147
60
21.
068
A00
293-
2Yy
f39
831
078
8148
228
014
1.06
8
AT
CO
0293
-1W
/Yy
f38
819
851
5226
232
042
1.04
8
CO
0041
2-5W
/Yy
f33
516
747
4442
50
025
1.07
6
Sn
ow
bir
d32
123
071
6036
342
023
1.06
5
Sif
ra56
436
967
9630
325
025
1.06
3
Sy
lvan
ayf
460
280
6273
2236
40
321.
057
Sm
arty
f49
831
763
8336
252
025
1.06
6
Go
ldfi
ng
ery
f42
913
231
3427
40
037
1.07
3
RZ
97-1
85y
f44
123
752
6227
205
039
1.07
2L
SD
8891
1412
1411
214
3P
erce
nta
ge
of
tota
l yie
ld a
cco
rdin
g t
o s
ize
clas
s.
2=1.
875-
2.5
in.,
3=2.
5-3.
25 in
., 4=
3.25
-4.0
in.,
5=>
4.0
in.
Rep
licat
ed t
rial
s ar
e th
e av
erag
e o
f 3
rep
licat
es.
LS
D in
dic
ates
leas
t si
gn
ific
ant
dif
fere
nce
(P
= 0
.05)
, cal
cula
ted
fo
r re
plic
ated
var
ieti
es.
2P
erce
nta
ge
of
the
stan
dar
d, A
tlan
tic,
fo
r >
1 7/
8" y
ield
.
4P
erce
nta
ge
of
tota
l th
at a
re p
icko
uts
.
1Y
ield
To
tal =
all
yie
ld in
clu
din
g p
icko
uts
. Y
ield
>1
7/8"
= c
ateg
ori
es 2
, 3, 4
an
d 5
exc
lud
ing
pic
kou
ts.
%P
O4
Var
iety
/Lin
eY
ield
(cw
t/A
)1%
of
Sta
nd
ard
2%
by
siz
e cl
ass3
Pla
nte
d 8
-in
. ap
art
wit
h 1
5 se
ed p
iece
s p
er 1
0-ft
plo
t. Y
ello
w f
lesh
var
ieti
es a
re in
dic
ated
wit
h y
f .
10
TA
CT
XSh
TED
TC
SH
HIB
Atla
ntic
56
52
46
20
Gre
en, G
row
th c
rack
sJO
MA
37
73
55
10
Kno
bs, G
row
th c
rack
s, G
reen
, Sca
bK
atah
din
47
73
55
20
Gre
en, M
issh
apen
Ken
nebe
c3
77
35
51
0K
nobs
, Gre
en, G
row
th c
rack
sSn
owde
n5
65
25
63
0G
reen
Supe
rior
57
63
45
00
Gre
enY
ukon
Gem
yf5
77
37
52
0M
issh
apen
, Gre
en
Yuk
on G
oldyf
56
72
55
30
Kno
bs, G
reen
AF2
574-
14
66
25
50
02n
d tu
bers
, Gre
en
AF2
866-
34
67
35
50
0 G
row
th c
rack
s, G
reen
AF4
047-
24
66
34
42
0G
row
th c
rack
sA
F033
8-17
56
63
55
20
Gre
en, G
row
th c
rack
sB
1992
-106
56
53
65
21
Gre
enB
NC
182-
55
65
26
62
0G
reen
NY
138
(Wan
eta)
57
73
75
20
Gre
en, G
row
th c
rack
sN
Y13
9 (L
amok
a)5
76
36
50
0G
reen
, Gro
wth
cra
cks
NY
143
(NY
B38
-40)
47
63
65
00
Gre
enN
Y14
5 (N
YD
40-3
5)5
77
26
51
0 G
row
th c
rack
s, G
reen
NY
E106
-44
75
25
61
0G
reen
AF4
013-
3yf4
78
36
51
0G
reen
, Mis
shap
enA
F412
5-1
57
62
55
10
Gre
en, H
airli
ne c
rack
sA
F413
0-7
56
63
66
20
Kno
bs, G
reen
AF4
157-
65
65
34
51
0 G
row
th c
rack
s, G
reen
AF4
222-
45
77
26
51
0G
reen
BN
C20
2-3yf
36
53
35
20
Mis
shap
en, G
reen
BN
C20
2-7yf
55
52
56
20
Gre
enB
2727
-25
66
35
51
0G
reen
B27
31-1
15
55
25
63
0 G
row
th c
rack
s, G
reen
B27
38-3
56
52
46
10
Gre
en
B27
81-3
yf4
67
25
52
0G
reen
, 2nd
tube
rs, G
row
th c
rack
s
Lehi
ghy
f5
66
35
54
0G
reen
Reb
a5
66
34
53
0G
reen
Res
ons
for P
icko
uts
Tub
er C
hara
cter
istic
s1In
tern
al D
efec
ts2
Tab
le 5
. Tub
er c
hara
cter
istic
s, in
tern
al a
nd e
xter
nal d
efec
ts fo
r rou
nd w
hite
pot
ato
eval
uatio
n tr
ial i
n R
ock
Sprin
gs, P
lant
Pat
holo
gy F
arm
, 201
1
Var
iety
/Lin
e
11
TA
CT
XS
hT
ED
TC
SH
HIB
NY
140
56
63
55
20
Gre
en, M
issh
apen
NY
141
57
63
66
10
Gre
en, M
issh
apen
NY
149y
f6
67
26
61
0R
hiz
oct
on
ia, G
reen
G1-
115
77
44
70
0M
issh
apen
G4-
25
77
36
52
0G
reen
, Mis
shap
en
G20
-31
56
63
65
10
Gre
enG
20-4
14
77
35
51
0G
reen
G73
-14
77
26
51
0R
hiz
oct
on
ia, G
reen
G87
-36
65
25
60
0G
reen
H4-
15
76
35
51
1G
row
th c
rack
s, M
issh
apen
H6-
34
77
26
51
0M
issh
apen
, 2n
d t
ub
ers,
Gre
enH
15-5
55
63
55
10
Gre
en, M
issh
apen
H15
-64
55
24
61
0K
no
bs,
Gre
enH
15-9
55
53
55
20
Gre
en, K
no
bs
H15
-17
56
63
65
30
Gre
enH
23-1
65
77
36
52
0M
issh
apen
, Gre
enH
25-2
56
63
55
20
Mis
shap
en, G
reen
H25
-44
77
34
54
0M
issh
apen
, Gro
wth
cra
cks
H25
-56
77
35
40
0G
reen
H63
-15
66
24
41
0G
reen
, Mis
shap
enM
SL
211-
35
77
36
40
0G
reen
MS
J126
-9Y
yf
47
63
65
10
Gre
en
A00
293-
2Yy
f5
78
36
43
0G
reen
, Mis
shap
en
AT
CO
0293
-1W
/Yy
f4
78
36
52
0 G
row
th c
rack
s, G
reen
CO
0041
2-5W
/Yy
f4
66
37
52
0M
issh
apen
, Gre
enS
no
wb
ird
47
83
64
00
Gro
wth
cra
cks,
Mis
shap
en, G
reen
Sif
ra4
77
35
50
0M
issh
apen
, 2n
d t
ub
ers,
Gre
en
Sy
lvan
ayf
57
73
65
01
Rh
izo
cto
nia
, Gre
enS
mar
tyf
47
83
65
20
Mis
shap
en, G
reen
Go
ldfi
ng
ery
f4
77
46
52
0M
issh
apen
, Gre
en
RZ
97-1
85y
f4
66
45
40
0M
issh
apen
, Gre
en
Var
iety
/Lin
eT
ub
er C
har
acte
rist
ics1
TE
D =
tu
ber
ey
e d
epth
: 1 =
ver
y d
eep
, 5 =
med
ium
, 9 =
ver
y s
hal
low
. TC
S =
tu
ber
cro
ss s
ecti
on
: 1 =
ver
y f
lat,
5 =
inte
rmed
iate
, 9 =
ver
y r
ou
nd
. 2In
tern
al D
efec
ts: H
H =
ho
llow
hea
rt, I
B =
inte
rnal
bro
wn
ing
. To
tal n
um
ber
ob
serv
ed o
ut
of
12 t
ub
ers
for
rep
licat
ed t
rial
s. 0
= n
ot
ob
serv
ed.
Sh
= t
ub
er s
hap
e: 1
= r
ou
nd
, 2 =
mo
stly
ro
un
d, 3
= r
ou
nd
-ob
lon
g, 4
= m
ost
ly o
blo
ng
, 5 =
ob
lon
g, 6
= o
blo
ng
-lo
ng
, 7 =
mo
stly
lon
g, 8
= lo
ng
, 9 =
cy
lind
rica
l.
1T
ub
er C
har
acte
rist
ics:
TA
= t
ub
er a
pp
eara
nce
: 1 =
ver
y p
oo
r, 5
= f
air,
9 =
exc
elle
nt.
C =
ski
n c
olo
r: 1
= p
urp
le, 2
= r
ed, 3
= p
ink,
4 =
dar
k b
row
n, 5
= b
row
n, 6
= t
an, 7
= b
uff
, 8 =
wh
ite,
9 =
cre
am.
Inte
rnal
Def
ects
2
T
X =
ski
n t
extu
re: 1
= p
arti
al r
uss
et, 2
= h
eav
y r
uss
et, 3
= m
od
. ru
sset
, 4 =
lig
ht
russ
et, 5
= n
ette
d, 6
= s
ligh
t n
et, 7
= m
od
. sm
oo
th, 8
= s
mo
oth
, 9 =
v
ery
sm
oo
th.
Res
on
s fo
r P
icko
uts
12
%S
pec
ific
To
tal
>1
7/8"
US
#1
23
45
Gra
vit
y
Chi
efta
in45
128
262
100
1633
130
331.
059
Dar
k R
ed N
orla
nd35
632
692
116
2958
50
41.
057
Mod
oc42
137
790
134
3742
110
41.
064
Red
Sun
set
294
256
8691
1957
100
111.
051
B21
52-1
7yf42
637
288
132
4838
20
21.
063
BC
O01
306-
2pk44
234
879
123
4234
30
111.
068
NY
144
566
404
7214
342
255
015
1.05
9
NY
B13
-158
849
283
175
3743
30
131.
049
B25
38-5
429
319
7383
2336
140
251.
062
B26
76-2
259
199
7852
3937
20
91.
074
B18
16-5
yf35
229
885
106
4837
00
91.
064
BC
O01
044-
2pur
390
347
8912
323
5312
06
1.06
0
BN
C20
1-1yf
369
331
9011
739
492
04
1.07
4B
2756
-7yf
252
195
7869
4236
00
81.
066
Adi
rond
ack
Blu
epur
408
282
6910
020
3216
029
1.06
5
Adi
rond
ack
Red
pk40
525
762
9144
154
028
1.06
0H
52-1
pur
332
195
5969
3425
00
351.
066
H73
-137
128
374
100
3436
40
181.
056
H85
-2yf
324
262
8093
5129
00
81.
074
H90
-437
229
880
106
6217
20
51.
069
H91
-1yf
487
275
5597
2028
70
401.
065
H12
2-4
472
373
7913
29
4523
220
1.05
6B
lack
berr
ypur
458
362
7912
818
3823
019
1.05
0
MS
R22
6-1R
Rpk
365
252
7089
4325
30
151.
061
MS
N21
5-2P
300
205
6973
3828
30
281.
072
MS
Q43
2-2P
Ppu
r25
619
675
6923
438
020
1.06
4
Spa
rtan
Spl
ashyf
425
356
8412
641
394
08
1.06
9N
DA
7985
-1R
519
421
8114
918
549
015
1.05
4
A99
331-
2RY
yf47
235
374
125
5024
10
101.
067
Var
iety
/Lin
e
Tab
le 6
. To
tal y
ield
, gre
ater
th
an 1
7/8
" y
ield
, per
cen
t o
f st
and
ard
, siz
e d
istr
ibu
tio
n, p
erce
nt
pic
kou
ts, a
nd
sp
ecif
ic g
rav
ity
fo
r re
d o
r p
urp
le s
kin
ned
po
tato
ev
alu
atio
n t
rial
in R
ock
Sp
rin
gs,
Pla
nt
Pat
ho
log
y F
arm
, 201
1
Yie
ld (
cwt/
A)1
% o
f
Sta
nd
ard
2%
by
siz
e cl
ass3
%P
O4
13
%Sp
ecifi
c
Tot
al>1
7/8
"U
S#1
23
45
Gra
vity
AC
9752
1-1R
/Yyf
409
254
6190
4319
00
231.
067
CO
9722
2-1R
pk36
926
572
9447
241
09
1.06
1C
O99
076-
6R23
918
276
6413
4914
020
1.06
7C
O99
256-
2R36
530
082
106
4336
30
71.
060
CO
0291
-5R
150
102
6436
2635
30
271.
055
Pur
ple
Maj
esty
pur
507
274
5597
3816
00
261.
070
Rod
eoyf
344
193
5668
3422
00
301.
067
Pas
sion
yf53
936
770
130
3930
10
171.
064
LSD
9996
1414
159
113
3 Perc
enta
ge o
f tot
al y
ield
acc
ordi
ng to
siz
e cl
ass.
2=
1.87
5-2.
5 in
., 3=
2.5-
3.25
in.,
4=3.
25-4
.0 in
., 5=
>4.0
in.
Rep
licat
ed tr
ials
are
the
aver
age
of 3
repl
icat
es.
LSD
indi
cate
s le
ast s
igni
fican
t diff
eren
ce (P
= 0
.05)
, cal
cula
ted
for r
eplic
ated
var
ietie
s.
Var
ietie
s w
ith c
olor
ed fl
esh
are
indi
cate
d by
yf fo
r yel
low
, pur
for p
urpl
e, a
nd pk
for p
ink.
Pl
ots
cons
iste
d of
10-
ft ro
ws
with
15
seed
pie
ces
spac
ed 8
-in. a
part
.
4 Perc
enta
ge o
f tot
al th
at a
re p
icko
uts.
1 Yie
ld T
otal
= a
ll yi
eld
incl
udin
g pi
ckou
ts.
Yie
ld >
1 7/
8" =
cat
egor
ies
2, 3
, 4 a
nd 5
exc
ludi
ng p
icko
uts.
2 Perc
enta
ge o
f the
sta
ndar
d, C
hief
tain
, for
>1
7/8"
yie
ld.
Var
iety
/Lin
eY
ield
(cw
t/A
)1%
of
Stan
dard
2
% b
y si
ze c
lass
3
%PO
4
14
TA
CT
XSh
TED
TC
SH
HIB
Chi
efta
in5
27
36
50
02n
d tu
bers
, Gre
en, G
row
th c
rack
s
Dar
k R
ed N
orla
nd5
27
35
50
0G
row
th c
rack
sM
odoc
62
72
56
10
Gro
wth
cra
cks
Red
Sun
set
52
83
56
11
Gre
en
B21
52-1
7yf5
26
36
50
0G
reen
BC
O01
306-
2pk
52
82
55
10
2nd
tube
rs, G
reen
NY
144
52
83
65
00
Gre
en, M
issh
apen
NY
B13
-15
27
36
50
0M
issh
apen
B25
38-5
41
73
45
00
Mis
shap
en, G
row
th c
rack
s
B26
76-2
52
72
66
00
Gre
en, M
issh
apen
B18
16-5
yf5
16
36
51
0K
nobs
BC
O01
044-
2pur
51
73
65
10
Mis
shap
en
BN
C20
1-1y
f5
27
25
60
0G
reen
B27
56-7
yf5
28
35
61
0M
issh
apen
Adi
rond
ack
Blu
epur
51
73
55
10
Kno
bs, M
issh
apen
Adi
rond
ack
Red
pk
52
73
55
00
Mis
shap
en, G
reen
H52
-1p
ur5
17
47
50
0M
issh
apen
, Gro
wth
cra
cks
H73
-15
27
26
60
0M
issh
apen
H85
-2y
f5
6**
62
56
10
Gro
wth
cra
cks
H90
-45
26
26
60
0G
reen
H91
-1y
f3
8**
73
55
00
Mis
shap
en, K
nobs
, Gre
en
H12
2-4
53
83
55
00
Gre
en, M
issh
apen
Bla
ckbe
rryp
ur5
18
46
50
0M
issh
apen
, Sca
b
MSR
226-
1RR
pk
41
84
55
00
Mis
shap
en
MSN
215-
2P5
17
35
52
0M
issh
apen
MSQ
432-
2PPpu
r5
17
46
50
0M
issh
apen
Spar
tan
Spla
shyf
56*
*7
36
51
0M
issh
apen
, Gre
en
ND
A79
85-1
R6
27
36
50
1G
reen
, Gro
wth
cra
cks
A99
331-
2RY
yf5
2**
82
65
00
Mis
shap
en, G
reen
, Gro
wth
cra
cks
Res
ons
for P
icko
uts
Tab
le 7
. Tub
er c
hara
cter
istic
s, in
tern
al a
nd e
xter
nal d
efec
ts fo
r red
ski
nned
pot
ato
eval
uatio
n tr
ial i
n R
ock
Sprin
gs, P
lant
Pat
holo
gy F
arm
, 201
1
Var
iety
/Lin
eT
uber
Cha
ract
eris
tics1
Inte
rnal
Def
ects
2
15
TA
CT
XSh
TED
TC
SH
HIB
AC
9752
1-1R
/Yyf
52
73
64
00
Mis
shap
en, G
reen
CO
9722
2-1R
pk
32
62
66
00
Scab
, Mis
shap
en, G
reen
CO
9907
6-6R
52
73
65
00
Gre
en, G
row
th c
rack
s
CO
9925
6-2R
52
83
66
10
Gre
en, G
row
th c
rack
s
CO
0291
-5R
52
73
55
10
Gre
en, G
row
th c
rack
s
Purp
le M
ajes
typ
ur4
16
36
52
0M
issh
apen
Rod
eoy
f4
27
36
51
0M
issh
apen
, Gre
en
Pass
ionyf
52
74
64
00
Gre
en, M
issh
apen
2**
= R
ed w
ith w
hite
spl
otch
s on
ski
n; 6
** =
Tan
ski
n w
ith p
urpl
e sp
lash
s; 8
** =
Whi
te w
ith p
urpl
e sp
lash
ski
n.
C =
ski
n co
lor:
1 =
purp
le, 2
= re
d, 3
= p
ink,
4 =
dar
k br
own,
5 =
bro
wn,
6 =
tan,
7 =
buf
f, 8
= w
hite
, 9 =
cre
am.
TED
= tu
ber e
ye d
epth
: 1 =
ver
y de
ep, 5
= m
ediu
m, 9
= v
ery
shal
low
. TC
S =
tube
r cro
ss s
ectio
n: 1
= v
ery
flat,
5 =
inte
rmed
iate
, 9 =
ver
y ro
und.
2 In
tern
al D
efec
ts: H
H =
hol
low
hea
rt, I
B =
inte
rnal
bro
wni
ng. T
otal
num
ber o
bser
ved
out o
f 12
tube
rs fo
r rep
licat
ed tr
ials
. 0
= no
t obs
erve
d.
S
h =
tub
er s
hap
e: 1
= r
ound
, 2 =
mos
tly
rou
nd, 3
= r
ound
-obl
ong,
4 =
mos
tly
obl
ong,
5 =
obl
ong,
6 =
obl
ong-
long
, 7 =
mos
tly
long
, 8 =
long
, 9 =
cy
lindr
ical
.
Var
ietie
s w
ith c
olor
ed fl
esh
are
indi
cate
d by
yf fo
r yel
low
, pur fo
r pur
ple,
and
Pk fo
r pin
k.
T
X =
ski
n te
xtur
e: 1
= p
arti
al r
usse
t, 2
= h
eavy
rus
set,
3 =
mod
. rus
set,
4 =
ligh
t ru
sset
, 5 =
net
ted,
6 =
slig
ht n
et, 7
= m
od. s
moo
th, 8
= s
moo
th, 9
= v
ery
sm
ooth
.
Res
ons
for P
icko
uts
1 Tub
er C
hara
cter
istic
s: T
A =
tube
r app
eara
nce:
1 =
ver
y po
or, 5
= fa
ir, 9
= e
xcel
lent
.
Var
iety
/Lin
eT
uber
Cha
ract
eris
tics1
Inte
rnal
Def
ects
2
16
%Sp
ecifi
cT
otal
>1 7
/8"
US#
12
34
5G
ravi
tyA
lpin
e R
usse
t (A
9305
-10)
301
137
4648
2917
00
411.
072
Cla
ssic
Rus
set (
A95
109-
1)44
235
079
123
2436
164
171.
067
Prem
ier R
usse
t (A
9315
7-LS
)31
718
155
6432
185
032
1.07
8R
io G
rand
e R
usse
t36
824
567
8633
2113
023
1.07
2R
usse
t Bur
bank
(#40
0)43
789
2031
96
60
781.
072
Rus
set N
orko
tah
#311
743
428
566
100
1921
260
311.
059
AF3
001-
633
715
647
5518
227
050
1.06
6
AF3
317-
532
714
243
5013
228
051
1.08
8A
F336
2-1
427
309
7110
814
2928
026
1.06
9
AF4
040-
235
613
036
468
199
061
1.07
4
AF3
011-
3432
620
563
7225
363
032
1.07
4A
F417
2-2
298
204
6872
2246
00
251.
075
AF4
185-
139
824
560
8628
320
032
1.06
2A
F437
2-2
230
100
4635
2917
00
431.
066
AF4
320-
730
613
544
4720
186
046
1.07
4
AF4
320-
1537
070
1925
811
00
771.
073
A01
025-
439
224
963
8718
2818
033
1.07
4
A98
345-
135
421
762
7627
197
932
1.07
7
A02
062-
1TE
301
141
4549
919
153
501.
067
AC
9937
5-1R
U36
418
649
6524
214
043
1.06
3C
O99
053-
3RU
348
212
6175
2025
160
331.
068
CO
9905
3-4R
U38
623
661
8320
2318
033
1.06
7
CO
9910
0-1R
U32
320
263
7118
359
028
1.06
8L
SD96
7615
1213
94
16
Rep
licat
ed tr
ials
are
the
aver
age
of 3
repl
icat
es.
LSD
indi
cate
s le
ast s
igni
fican
t diff
eren
ce (P
= 0
.05)
, cal
cula
ted
for r
eplic
ated
var
ietie
s.Pl
ots
cons
iste
d of
10-
ft ro
ws
with
12
seed
pie
ces
spac
ed 1
0-in
. apa
rt.
Tab
le 8
. Tot
al y
ield
, gre
ater
than
1 7
/8"
yiel
d, p
erce
nt o
f sta
ndar
d, s
ize
dist
ribut
ion,
per
cent
pic
kout
s, a
nd s
peci
fic g
ravi
ty fo
r rus
set
skin
ned
or lo
ng w
hite
pot
ato
eval
uatio
n tr
ial i
n R
ock
Sprin
gs, P
lant
Pat
holo
gy F
arm
, 201
1
3 Perc
enta
ge o
f tot
al y
ield
acc
ordi
ng to
siz
e cl
ass:
2=1
.875
-2.5
in.,
3=2.
5-3.
25 in
., 4=
3.25
-4.0
in.,
5=>4
.0 in
.
%PO
4V
arie
ty/L
ine
4 Perc
enta
ge o
f tot
al th
at a
re p
icko
uts.
Yie
ld (c
wt/
A)1
% o
f
Stan
dard
2%
by
size
cla
ss3
1 Yie
ld T
otal
= a
ll yi
eld
incl
udin
g pi
ckou
ts.
Yie
ld >
1 7/
8" =
cat
egor
ies
2, 3
, 4 a
nd 5
exc
ludi
ng p
icko
uts.
2 Perc
enta
ge o
f the
sta
ndar
d, R
usse
t Nor
kota
h #3
117
for >
1 7/
8" y
ield
.
17
TA
CT
XSh
TED
TC
SH
HIB
Alp
ine
Rus
set (
A93
05-1
0)4
66
47
40
0K
nobs
, Gre
en, M
issh
apen
Cla
ssic
Rus
set (
A95
109-
1)5
54
56
52
0K
nobs
, Gre
enPr
emie
r Rus
set (
A93
157-
LS)
55
44
56
30
Kno
bs, G
row
th c
rack
s, G
reen
Rio
Gra
nde
Rus
set
45
34
75
40
Kno
bs, G
reen
, Gro
wth
cra
cks
Rus
set B
urba
nk (#
400)
46
45
54
30
Mis
shap
en, K
nobs
Rus
set N
orko
tah
#311
75
53
46
52
0M
issh
apen
, Kno
bsA
F300
1-6
46
64
65
10
Kno
bs, G
reen
, Gro
wth
cra
cks
AF3
317-
54
53
46
52
0M
issh
apen
, Gre
enA
F336
2-1
56
44
64
00
Mis
shap
enA
F404
0-2
46
64
64
10
Mis
shap
en, G
row
th c
rack
s, G
reen
AF3
011-
344
66
46
41
0M
issh
apen
, Gro
wth
cra
cks
AF4
172-
24
66
46
42
0M
issh
apen
AF4
185-
14
54
45
52
0M
issh
apen
, Gre
enA
F437
2-2
46
64
75
10
Kno
bs, G
reen
AF4
320-
73
66
46
41
0K
nobs
, Mis
shap
enA
F432
0-15
36
64
64
20
Kno
bs, M
issh
apen
, Gre
enA
0102
5-4
46
44
75
10
Mis
shap
en, G
reen
A98
345-
15
66
47
52
0M
issh
apen
, Gro
wth
cra
cks
A02
062-
1TE
55
34
75
10
Mis
shap
enA
C99
375-
1RU
46
44
65
30
Mis
shap
en, G
reen
CO
9905
3-3R
U5
54
47
53
0M
issh
apen
, Gre
enC
O99
053-
4RU
46
44
74
30
Mis
shap
en, G
reen
CO
9910
0-1R
U5
54
46
50
0M
issh
apen
Tab
le 9
. Tub
er c
hara
cter
istic
s, in
tern
al a
nd e
xter
nal d
efec
ts fo
r rus
set s
kinn
ed o
r lon
g w
hite
pot
ato
eval
uatio
n tr
ial i
n R
ock
Sprin
gs, P
lant
Pa
thol
ogy
Farm
, 201
1
Var
iety
/Lin
eT
uber
Cha
ract
eris
tics1
Inte
rnal
Def
ects
2
Sh =
tub
er s
hap
e: 1
= r
ound
, 2 =
mos
tly
rou
nd, 3
= r
ound
-obl
ong,
4 =
mos
tly
obl
ong,
5 =
obl
ong,
6 =
obl
ong-
long
, 7 =
mos
tly
long
, 8 =
long
, 9 =
cy
lindr
ical
.
1 Tub
er C
hara
cter
istic
s: T
A =
tube
r app
eara
nce:
1 =
ver
y po
or, 5
= fa
ir, 9
= e
xcel
lent
.
C =
ski
n co
lor:
1 =
purp
le, 2
= re
d, 3
= p
ink,
4 =
dar
k br
own,
5 =
bro
wn,
6 =
tan,
7 =
buf
f, 8
= w
hite
, 9 =
cre
am.
TED
= tu
ber e
ye d
epth
: 1 =
ver
y de
ep, 5
= m
ediu
m, 9
= v
ery
shal
low
. TC
S =
tube
r cro
ss s
ectio
n: 1
= v
ery
flat,
5 =
inte
rmed
iate
, 9 =
ver
y ro
und.
2 In
tern
al D
efec
ts: H
H =
hol
low
hea
rt, I
B =
inte
rnal
bro
wni
ng. T
otal
num
ber o
bser
ved
out o
f 12
tube
rs fo
r rep
licat
ed tr
ials
. 0
= no
t ob
serv
ed.
T
X =
ski
n te
xtur
e: 1
= p
arti
al r
usse
t, 2
= h
eavy
rus
set,
3 =
mod
. rus
set,
4 =
ligh
t ru
sset
, 5 =
net
ted,
6 =
slig
ht n
et, 7
= m
od. s
moo
th, 8
= s
moo
th, 9
=
very
sm
ooth
.
Res
ons
for P
icko
uts
18
%T
otal
>1 7
/8"
US#
12
34
5
Chi
efta
in22
618
280
100
2151
90
16D
ark
Red
Nor
land
345
288
8415
946
370
05
Mod
oc34
528
081
154
3547
00
8R
ed S
unse
t16
814
686
8041
450
03
B21
52-1
7yf31
923
875
131
6312
00
0B
CO
0130
6-2pk
320
137
4376
403
00
20N
Y14
422
210
447
5737
100
015
NY
B13
-129
425
085
138
5828
00
4
B18
16-5
yf25
221
184
116
5924
00
2
BC
O01
044-
2pur
337
300
8916
539
3812
06
BN
C20
1-1yf
353
293
8316
245
380
04
B27
56-7
yf27
722
481
123
4536
00
5A
diro
ndac
k B
luepu
r27
622
381
123
5327
00
11A
diro
ndac
k R
edpk
443
318
7217
553
190
011
H52
-1pu
r18
710
757
5922
2510
033
H73
-125
518
171
100
5219
00
12
H85
-2yf
185
134
7274
720
00
0
H90
-426
517
365
9556
100
06
H91
-1yf
370
221
6012
141
190
032
H12
2-4
267
207
7811
432
424
020
AO
0293
-2Y
265
206
7811
352
260
06
MSR
226-
1RR
(Ras
pber
ry)pk
311
201
6511
156
90
014
MSN
215-
2P(C
olon
ial P
urpl
e)16
269
4338
3013
00
50
MSQ
432-
2PP
pur
216
190
8810
452
1818
00
MSJ
126-
9Y20
319
596
107
3047
190
0
ND
A79
85-1
R39
033
285
183
3748
00
9
A99
331-
2RY
yf40
120
050
110
473
00
20
AC
9752
1-1R
/Yyf
136
8260
4551
81
00
Var
iety
/Lin
eY
ield
(cw
t/A
)1%
of
Stan
dard
2%
by
size
cla
ss3
%PO
4
Tab
le 1
0. T
otal
yie
ld, g
reat
er th
an 1
7/8
" yi
eld,
per
cent
of s
tand
ard,
siz
e di
strib
utio
n, p
erce
nt p
icko
uts,
and
spe
cific
gra
vity
for e
arly
se
ason
(90
days
of g
row
th) p
otat
o ev
alua
tion
tria
l in
Roc
k Sp
rings
, Pla
nt P
atho
logy
Far
m, 2
011
19
%T
otal
>1 7
/8"
US#
12
34
5
CO
9722
2-1R
pk31
925
780
141
5921
00
1
CO
9907
6-6R
9668
7138
3734
00
22C
O99
256-
2R20
312
361
6824
325
012
CO
0291
-5R
8257
7032
4623
00
9
Pur
ple
Maj
esty
pur
222
8237
4531
60
021
Pas
sion
yf31
513
342
7329
130
016
Snow
bird
320
206
6411
341
230
024
Smar
tyf51
730
359
167
506
20
17
Gol
dfin
geryf
377
110
2960
227
00
22
RZ
97-1
85yf
281
196
7010
855
140
010
BN
C24
3-1pu
r33
454
1630
133
00
30
G1-
1117
87
44
40
00
64H
63-1
yf28
023
785
131
6124
00
4Su
perio
r25
122
288
122
2445
200
6B
2538
-529
820
769
114
3919
120
24
AF4
013-
3yf38
323
461
129
538
00
20
3 Perc
enta
ge o
f tot
al y
ield
acc
ordi
ng to
siz
e cl
ass.
2=
1.87
5-2.
5 in
., 3=
2.5-
3.25
in.,
4=3.
25-4
.0 in
., 5=
>4.0
in.
Non
-rep
licat
ed tr
ial.
Var
ietie
s w
ith c
olor
ed fl
esh
are
indi
cate
d by
yf fo
r yel
low
, pur
for p
urpl
e, a
nd pk
for p
ink.
Pl
ots
cons
iste
d of
10-
ft ro
ws
with
15
seed
pie
ces
spac
ed 8
-in. a
part
.
4 Perc
enta
ge o
f tot
al th
at a
re p
icko
uts.
1 Yie
ld T
otal
= a
ll yi
eld
incl
udin
g pi
ckou
ts.
Yie
ld >
1 7/
8" =
cat
egor
ies
2, 3
, 4 a
nd 5
exc
ludi
ng p
icko
uts.
2 Perc
enta
ge o
f the
sta
ndar
d, C
hief
tain
, for
>1
7/8"
yie
ld.
Var
iety
/Lin
eY
ield
(cw
t/A
)1%
of
Stan
dard
2%
by
size
cla
ss3
%PO
4
20
TA
CT
XSh
TED
TC
SH
HIB
Chi
efta
in5
27
36
50
02n
d tu
bers
Dar
k R
ed N
orla
nd5
27
35
50
0G
reen
Mod
oc6
27
25
60
0G
reen
, Gro
wth
cra
cks
Red
Sun
set
62
83
56
00
Mis
shap
en
B21
52-1
7yf5
26
36
50
0
BC
O01
306-
2pk
42
82
55
00
2nd
tube
rs
NY
144
52
83
65
00
Mis
shap
en
NY
B13
-15
27
36
50
0M
issh
apen
B18
16-5
yf5
16
36
50
0M
issh
apen
BC
O01
044-
2pur
51
73
65
00
Mis
shap
enB
NC
201-
1yf
52
72
46
00
Gre
en, M
issh
apen
B27
56-7
yf5
28
35
60
0G
row
th c
rack
sA
diro
ndac
k B
luepu
r5
17
35
50
0M
issh
apen
Adi
rond
ack
Red
pk
52
73
55
00
2nd
tube
rsH
52-1
pur
41
74
75
00
Gro
wth
cra
cks
H73
-15
27
26
60
0M
issh
apen
H85
-2y
f6
6**
62
56
00
H90
-45
26
26
60
0G
reen
, Gro
wth
cra
cks
H91
-1y
f4
8**
73
55
00
Gro
wth
cra
cks
H12
2-4
53
83
55
00
Mis
shap
enA
O02
93-2
Y6
78
36
40
0G
row
th c
rack
sM
SR22
6-1R
R(R
aspb
erry
)pk5
18
45
50
0M
issh
apen
MSN
215-
2P(C
olon
ial P
urpl
e)5
17
25
40
0M
issh
apen
MSQ
432-
2PPpu
r5
17
46
50
0M
issh
apen
MSJ
126-
9Y5
76
36
50
0
ND
A79
85-1
R5
27
36
50
0M
issh
apen
, Gro
wth
cra
cks
A99
331-
2RY
yf5
2**
82
65
00
Mis
shap
en
AC
9752
1-1R
/Yyf
52
73
64
00
Mis
shap
en
Tub
er C
hara
cter
istic
s1In
tern
al D
efec
ts2
Tab
le 1
1. T
uber
cha
ract
eris
tics,
inte
rnal
and
ext
erna
l def
ects
for e
arly
sea
son
(90
days
of g
row
th) p
otat
o ev
alua
tion
tria
l in
Roc
k Sp
rings
, Pla
nt
Path
olog
y Fa
rm, 2
011
Var
iety
/Lin
eR
eson
s fo
r Pic
kout
s
21
TA
CT
XSh
TED
TC
SH
HIB
CO
9722
2-1R
pk
62
62
66
00
CO
9907
6-6R
62
73
65
00
Mis
shap
en
CO
9925
6-2R
52
83
66
00
Gre
en, M
issh
apen
CO
0291
-5R
62
73
55
00
Gre
en
Purp
le M
ajes
typ
ur5
16
36
50
0M
issh
apen
Pass
ionyf
42
73
64
00
Mis
shap
en
Snow
bird
57
83
64
00
2nd
tube
rs, G
row
th c
rack
s
Smar
tyf4
78
36
50
0M
issh
apen
, 2nd
tube
rs, G
reen
Gol
dfin
geryf
47
74
65
00
Mis
shap
en, G
reen
RZ
97-1
85yf
56
64
54
00
2nd
tube
rs, M
issh
apen
BN
C24
3-1p
ur5
18
37
50
02n
d tu
bers
G1-
114
77
44
70
0M
issh
apen
H63
-1y
f5
66
24
40
0M
issh
apen
Supe
rior
47
63
45
00
Mis
shap
enB
2538
-53
17
34
50
0M
issh
apen
, Gro
wth
cra
cks
AF4
013-
3yf
57
83
65
00
2nd
tube
rs, M
issh
apen
2**
= R
ed w
ith w
hite
spl
otch
s on
ski
n; 6
** =
Tan
ski
n w
ith p
urpl
e sp
lash
s; 8
** =
Whi
te w
ith p
urpl
e sp
lash
ski
n.
1 Tub
er C
hara
cter
istic
s: T
A =
tube
r app
eara
nce:
1 =
ver
y po
or, 5
= fa
ir, 9
= e
xcel
lent
.
C =
ski
n co
lor:
1 =
purp
le, 2
= re
d, 3
= p
ink,
4 =
dar
k br
own,
5 =
bro
wn,
6 =
tan,
7 =
buf
f, 8
= w
hite
, 9 =
cre
am.
Inte
rnal
Def
ects
2
T
X =
ski
n te
xtur
e: 1
= p
arti
al r
usse
t, 2
= h
eavy
rus
set,
3 =
mod
. rus
set,
4 =
ligh
t ru
sset
, 5 =
net
ted,
6 =
slig
ht n
et, 7
= m
od. s
moo
th, 8
= s
moo
th, 9
= v
ery
sm
ooth
.
Res
ons
for P
icko
uts
Var
iety
/Lin
eT
uber
Cha
ract
eris
tics1
TED
= tu
ber e
ye d
epth
: 1 =
ver
y de
ep, 5
= m
ediu
m, 9
= v
ery
shal
low
. TC
S =
tube
r cro
ss s
ectio
n: 1
= v
ery
flat,
5 =
inte
rmed
iate
, 9 =
ver
y ro
und.
2 In
tern
al D
efec
ts: H
H =
hol
low
hea
rt, I
B =
inte
rnal
bro
wni
ng. T
otal
num
ber o
bser
ved
out 4
for n
on re
plic
ated
tria
l. 0
= n
ot o
bser
ved.
Sh =
tub
er s
hap
e: 1
= r
ound
, 2 =
mos
tly
rou
nd, 3
= r
ound
-obl
ong,
4 =
mos
tly
obl
ong,
5 =
obl
ong,
6 =
obl
ong-
long
, 7 =
mos
tly
long
, 8 =
long
, 9 =
cy
lindr
ical
.
22
%S
pec
ific
To
tal
>1
7/8"
US
#1
23
45
Gra
vit
yR
uss
et N
ork
ota
h27
618
667
100
1632
190
291.
070
Alp
ine
Ru
sset
(A
9305
-10)
359
102
2955
1514
00
681.
082
Cla
ssic
Ru
sset
(A
9510
9-1)
321
260
8114
025
4016
015
1.07
4
Pre
mie
r R
uss
et (
A93
157-
LS
)29
915
351
8327
240
041
1.09
0
Rio
Gra
nd
e R
uss
et36
919
352
104
2418
100
421.
084
Ru
sset
Bu
rban
k (#
400)
305
3913
2112
10
081
1.07
1
Ru
sset
No
rko
tah
#31
1719
910
754
5829
250
039
1.06
5
Sh
epo
dy
382
8222
447
105
075
1.07
7A
F30
01-6
565
361
6419
44
2322
1535
1.07
4A
F33
17-5
252
8433
4511
166
064
1.10
1A
F33
62-1
475
313
6616
811
3618
034
1.07
6
AF
4040
-236
816
144
876
1615
753
1.08
3A
F30
11-3
440
221
754
117
1322
190
431.
086
AF
4172
-234
317
952
9720
266
040
1.08
1
AF
4185
-139
219
349
104
1516
180
451.
072
AF
4113
-249
426
654
143
1227
140
421.
066
AF
4116
-937
115
241
824
1126
059
1.06
4
AF
4303
-143
011
727
6316
110
068
1.08
1
A01
025-
445
926
257
141
1131
150
411.
074
A98
345-
143
619
645
106
1126
80
531.
088
A02
062-
1TE
289
7526
407
118
074
1.07
0
AC
9937
5-1R
U54
816
731
907
159
066
1.07
8
CO
9905
3-3R
U48
323
448
126
321
186
511.
071
CO
9905
3-4R
U51
218
636
100
1814
40
581.
071
CO
9910
0-1R
U41
528
468
153
1725
270
291.
071
Go
ldfi
ng
ery
f57
815
427
8317
100
062
1.07
6
Sif
ra57
231
856
171
2628
20
341.
065
Rod
eoy
f51
733
765
181
2436
60
301.
072
3P
erce
nta
ge
of
tota
l yie
ld a
cco
rdin
g t
o s
ize
clas
s.
2=1.
875-
2.5
in.,
3=2.
5-3.
25 in
., 4=
3.25
-4.0
in.,
5=>
4.0
in.
No
n-r
eplic
ated
tri
al.
Var
ieti
es w
ith
co
lore
d f
lesh
are
ind
icat
ed b
y y
f fo
r y
ello
w.
Plo
ts c
on
sist
ed o
f 15
-ft
row
s w
ith
15
seed
pie
ces
spac
ed 1
2-in
. ap
art.
Tab
le 1
2. T
ota
l yie
ld, g
reat
er t
han
1 7
/8"
yie
ld, p
erce
nt
of
stan
dar
d, s
ize
dis
trib
uti
on
, per
cen
t p
icko
uts
, an
d s
pec
ific
gra
vit
y f
or
spac
ing
p
ota
to e
val
uat
ion
tri
al in
Ro
ck S
pri
ng
s, P
lan
t P
ath
olo
gy
Far
m, 2
011
4P
erce
nta
ge
of
tota
l th
at a
re p
icko
uts
.
1Y
ield
To
tal =
all
yie
ld in
clu
din
g p
icko
uts
. Y
ield
>1
7/8"
= c
ateg
ori
es 2
, 3, 4
an
d 5
exc
lud
ing
pic
kou
ts.
2P
erce
nta
ge
of
the
stan
dar
d, R
uss
et N
ork
ota
h, f
or
>1
7/8"
yie
ld.
Var
iety
/Lin
eY
ield
(cw
t/A
)1%
of
Sta
nd
ard
2%
by
siz
e cl
ass3
%P
O4
23
TA
CT
XS
hT
ED
TC
SH
HIB
Ru
sset
No
rko
tah
55
34
65
30
Gre
en, M
issh
apen
Alp
ine
Ru
sset
(A
9305
-10)
46
64
74
00
Mis
shap
en, K
no
bs
Cla
ssic
Ru
sset
(A
9510
9-1)
55
45
65
30
Kn
ob
s, G
reen
Pre
mie
r R
uss
et (
A93
157-
LS
)4
54
45
64
0M
issh
apen
, Gro
wth
cra
cks,
Kn
ob
s
Rio
Gra
nd
e R
uss
et5
53
47
53
0M
issh
apen
Ru
sset
Bu
rban
k (#
400)
36
45
54
00
Kn
ob
s, M
issh
apen
Ru
sset
No
rko
tah
#31
175
53
46
52
0S
cab
, Mis
shap
en
Sh
epo
dy
47
74
74
00
Kn
ob
s, M
issh
apen
, Gre
en, S
cab
AF
3001
-65
66
46
52
0G
reen
, Kn
ob
s, 2
nd
tu
ber
s, M
issh
apen
AF
3317
-54
53
46
50
0K
no
bs,
Mis
shap
en, G
reen
AF
3362
-15
64
46
40
0M
issh
apen
, Sca
bA
F40
40-2
36
64
64
10
Mis
shap
enA
F30
11-3
44
66
46
42
0M
issh
apen
, Sca
bA
F41
72-2
46
64
64
00
Mis
shap
en, S
cab
, Gre
enA
F41
85-1
45
44
55
30
Mis
shap
en, G
reen
, Gro
wth
cra
cks
AF
4113
-24
76
46
50
0M
issh
apen
, Gro
wth
cra
cks,
Gre
enA
F41
16-9
55
45
75
10
Kn
ob
s, G
row
th c
rack
s, G
reen
, M
issh
apen
AF
4303
-14
10
Gre
en, M
issh
apen
A01
025-
44
64
47
50
0M
issh
apen
, Gre
enA
9834
5-1
46
64
75
10
Sca
b, M
issh
apen
, Gre
enA
0206
2-1T
E3
53
57
50
0M
issh
apen
AC
9937
5-1R
U3
64
46
53
1M
issh
apen
, Kn
ob
sC
O99
053-
3RU
45
44
75
41
Mis
shap
en, G
reen
CO
9905
3-4R
U4
64
47
40
0G
row
th c
rack
s
CO
9910
0-1R
U5
54
46
51
0M
issh
apen
, Kn
ob
s
Go
ldfi
ng
ery
f3
77
46
52
0M
issh
apen
, Gre
en, K
no
bs
Sif
ra5
77
35
50
0G
reen
, Sca
b, 2
nd
tu
ber
s
Ro
deo
yf
42
73
65
00
Mis
shap
en
Tu
ber
Ch
arac
teri
stic
s1In
tern
al D
efec
ts2
TE
D =
tu
ber
ey
e d
epth
: 1 =
ver
y d
eep
, 5 =
med
ium
, 9 =
ver
y s
hal
low
. TC
S =
tu
ber
cro
ss s
ecti
on
: 1 =
ver
y f
lat,
5 =
inte
rmed
iate
, 9 =
ver
y r
ou
nd
. 2In
tern
al D
efec
ts: H
H =
ho
llow
hea
rt, I
B =
inte
rnal
bro
wn
ing
. To
tal n
um
ber
ob
serv
ed o
ut
of
4 fo
r n
on
rep
licat
ed t
rial
. 0
= n
ot
ob
serv
ed.
Sh =
tub
er s
hap
e: 1
= r
ound
, 2 =
mos
tly
rou
nd, 3
= r
ound
-obl
ong,
4 =
mos
tly
obl
ong,
5 =
obl
ong,
6 =
obl
ong-
long
, 7 =
mos
tly
long
, 8 =
long
, 9 =
cy
lindr
ical
.
Tab
le 1
3. T
ub
er c
har
acte
rist
ics,
inte
rnal
an
d e
xter
nal
def
ects
fo
r sp
acin
g p
ota
to e
val
uat
ion
tri
al in
Ro
ck S
pri
ng
s, P
lan
t P
ath
olo
gy
Far
m, 2
011
1T
ub
er C
har
acte
rist
ics:
TA
= t
ub
er a
pp
eara
nce
: 1 =
ver
y p
oo
r, 5
= f
air,
9 =
exc
elle
nt.
C =
ski
n c
olo
r: 1
= p
urp
le, 2
= r
ed, 3
= p
ink,
4 =
dar
k b
row
n, 5
= b
row
n, 6
= t
an, 7
= b
uff
, 8 =
wh
ite,
9 =
cre
am.
Var
iety
/Lin
e
T
X =
ski
n te
xtur
e: 1
= p
arti
al r
usse
t, 2
= h
eavy
rus
set,
3 =
mod
. rus
set,
4 =
ligh
t ru
sset
, 5 =
net
ted,
6 =
slig
ht n
et, 7
= m
od. s
moo
th, 8
= s
moo
th, 9
= v
ery
sm
ooth
.
Res
on
s fo
r P
icko
uts
24
%%
of
Spec
ific
Tot
al>1
7/8
"U
S#1
Stan
dard
22
34
5G
ravi
ty
Alp
ine
Rus
set (
A93
05-1
0)30
113
746
3629
170
041
1.07
2A
tlant
ic42
738
390
100
1349
261
81.
078
Chi
efta
in45
128
262
7416
3313
033
1.05
9C
lass
ic R
usse
t (A
9510
9-1)
442
350
7991
2 436
164
171.
067
Dar
k R
ed N
orla
nd35
632
692
8529
585
04
1.05
7JO
MA
488
276
5672
1228
170
421.
069
Kat
ahdi
n32
828
187
7315
5 022
012
1.06
2K
enne
bec
458
232
5160
1 025
160
471.
064
Mod
oc42
137
790
9837
4211
04
1.06
4P
rem
ier
Rus
set (
A93
157-
LS)
317
181
5547
3218
50
321.
078
Red
Sun
set
294
256
8667
1957
100
111.
051
Rio
Gra
nde
Rus
set
368
245
6764
3321
130
231.
072
Rus
set B
urba
nk (
#400
)43
789
2023
96
60
781.
072
Rus
set N
orko
tah
#311
743
428
566
7419
2126
031
1.05
9
Snow
den
446
427
9611
138
4710
03
1.07
7
Supe
rior
402
347
8791
2251
140
81.
064
Yuk
on G
emyf
466
343
7590
2237
160
221.
062
Yuk
on G
oldyf
359
292
8276
1336
330
161.
069
AF2
574-
150
031
864
8317
398
033
1.07
0A
F286
6-3
473
417
8810
92 4
4221
07
1.05
7A
F300
1-6
337
156
4741
1822
70
501.
066
AF3
317-
532
714
243
3713
228
051
1.08
8A
F336
2-1
427
309
7181
1429
280
261.
069
AF4
040-
235
613
036
348
199
061
1.07
4A
F404
7-2
406
304
7579
1739
190
211.
059
AF0
338-
1748
439
781
104
1631
340
151.
075
B19
92-1
0633
628
885
752 4
4912
011
1.06
5B
2152
-17yf
426
372
8897
4838
20
21.
063
Tab
le 1
4. T
otal
yie
ld, g
reat
er th
an 1
7/8
" pe
rcen
t of s
tand
ard,
siz
e di
strib
utio
n, p
erce
nt p
icko
uts,
and
spe
cific
gra
vity
for N
E103
1 po
tato
ev
alua
tion
tria
l in
Roc
k Sp
rings
, Pla
nt P
atho
logy
Far
m, 2
011
%PO
4V
arie
ty/L
ine
Yie
ld (c
wt/
A)1
% b
y si
ze c
lass
3
25
%%
of
Spec
ific
Tot
al>1
7/8
"U
S#1
Stan
dard
22
34
5G
ravi
ty
BC
O01
306-
2pk44
234
879
9142
343
011
1.06
8B
NC
182-
546
741
388
108
2446
170
61.
079
NY
138
(Wan
eta)
443
394
8910
39
3842
09
1.07
2N
Y13
9 (L
amok
a)36
631
987
833 0
4116
010
1.07
1N
Y14
3 (N
YB
38-4
0)27
022
686
5937
3316
09
1.05
6N
Y14
456
640
472
105
4225
50
151.
059
NY
145
(NY
D40
-35)
331
277
8372
4929
05
21.
076
NY
B13
-158
849
283
128
3743
30
131.
049
NY
E10
6-4
479
434
9111
321
4623
05
1.07
7L
SD84
8814
1214
133
13
Rep
licat
ed tr
ials
are
the
aver
age
of 3
repl
icat
es.
LSD
indi
cate
s le
ast s
igni
fican
t diff
eren
ce (P
= 0.
05).
Rus
sets
wer
e pl
ante
d 10
-in. a
part
with
12
seed
pie
ces
per 1
0-ft
plo
t, al
l oth
er v
arie
ties
wer
e sp
aced
8-in
. apa
rt w
ith 1
5 se
ed p
iece
s pe
r 10-
ft
plot
.
3 Perc
enta
ge o
f tot
al y
ield
acc
ordi
ng to
siz
e cl
ass.
2=1
.875
-2.5
in.,
3=2.
5-3.
25 in
., 4=
3.25
-4.0
in.,
5=>4
.0 in
.4 Pe
rcen
tage
of t
otal
that
are
pic
kout
s. V
arie
ties
with
col
ored
fles
h ar
e in
dica
ted
by yf
for y
ello
w a
nd p
k for p
ink.
1 Yie
ld T
otal
= a
ll yi
eld
incl
udin
g pi
ckou
ts.
Yie
ld >
1 7/
8" =
cat
egor
ies
2, 3
, 4 a
nd 5
exc
ludi
ng p
icko
uts.
2 Perc
enta
ge o
f the
sta
ndar
d, A
tlant
ic, f
or >
1 7/
8" y
ield
.
Var
iety
/Lin
eY
ield
(cw
t/A
)1%
by
size
cla
ss3
%PO
4
26
TA
CT
XSh
TED
TC
SH
HIB
Alp
ine
Rus
set (
A93
05-1
0)4
66
47
40
02n
d tu
bers
, Gre
en, M
issh
apen
Cla
ssic
Rus
set (
A95
109-
1)5
54
56
52
0K
nobs
, Gre
en
Atla
ntic
56
52
46
20
Gre
en, G
row
th c
rack
s
Chi
efta
in5
27
36
50
02n
d tu
bers
, Gre
en, G
row
th c
rack
s
Dar
k R
ed N
orla
nd5
27
35
50
0G
row
th c
rack
s
JOM
A3
77
35
51
0K
nobs
, Gro
wth
cra
cks,
, Gre
en, S
cab
Kat
ahdi
n4
77
35
52
0G
reen
, Mis
shap
en
Ken
nebe
c3
77
35
51
0G
reen
, Gro
wth
cra
cks,
Kno
bs
Mod
oc6
27
25
61
0G
row
th c
rack
s
Prem
ier R
usse
t (A
9315
7-LS
)5
54
45
63
0K
nobs
, Gro
wth
cra
cks,
, Gre
en
Red
Sun
set
52
83
56
11
Gre
en
Rio
Gra
nde
Rus
set
45
34
75
40
Kno
bs, G
reen
, Gro
wth
cra
cks
Rus
set B
urba
nk (#
400)
46
45
54
30
Mis
shap
en, K
nobs
Rus
set N
orko
tah
#311
75
53
46
52
0M
issh
apen
, Kno
bs
Snow
den
56
52
56
30
Gre
en
Supe
rior
57
63
45
00
Gre
en
Yuk
on G
emy
f5
77
37
52
0M
issh
apen
, Gre
en
Yuk
on G
oldy
f5
67
25
53
0K
nobs
, Gre
en
AF2
574-
14
66
25
50
02n
d tu
bers
, Gre
en
AF2
866-
34
67
35
50
0 G
row
th c
rack
s, G
reen
AF3
001-
64
66
46
51
0K
nobs
, Gre
en, G
row
th c
rack
s
AF3
317-
54
53
46
52
0M
issh
apen
, Gre
en
AF3
362-
15
64
46
40
0M
issh
apen
AF4
040-
24
66
46
41
0M
issh
apen
, Gro
wth
cra
cks,
Gre
en
AF4
047-
24
66
34
42
0G
row
th c
rack
s
AF0
338-
175
66
35
52
0G
reen
, Gro
wth
cra
cks
B19
92-1
065
65
36
52
1G
reen
B21
52-1
7yf5
26
36
50
0G
reen
Tab
le 1
5. T
uber
cha
ract
eris
tics,
inte
rnal
and
ext
erna
l def
ects
for N
E103
1 po
tato
eva
luat
ion
tria
l in
Roc
k Sp
rings
, Pla
nt P
atho
logy
Far
m, 2
011
Var
iety
/Lin
eT
uber
Cha
ract
eris
tics1
Inte
rnal
Def
ects
2
Res
ons
for P
icko
uts
27
TA
CT
XSh
TED
TC
SH
HIB
BC
O01
306-
2pk
52
82
55
10
2nd
tube
rs, G
reen
BN
C18
2-5
56
52
66
20
Gre
en
NY
138
(Wan
eta)
57
73
75
20
Gre
en, G
row
th c
rack
s
NY
139
(Lam
oka)
57
63
65
00
Gre
en, G
row
th c
rack
s
NY
143
(NY
B38
-40)
47
63
65
00
Gre
en
NY
144
52
83
65
00
Gre
en, M
issh
apen
NY
145
(NY
D40
-35)
57
72
65
10
Gro
wth
cra
cks,
Gre
en
NY
B13
-15
27
36
50
0M
issh
apen
NY
E106
-44
75
25
61
0G
reen
C =
ski
n co
lor:
1 =
purp
le, 2
= re
d, 3
= p
ink,
4 =
dar
k br
own,
5 =
bro
wn,
6 =
tan,
7 =
buf
f, 8
= w
hite
, 9 =
cre
am.
T
X =
ski
n te
xtur
e: 1
= p
artia
l rus
set,
2 =
heav
y ru
sset
, 3 =
mod
. rus
set,
4 =
light
russ
et, 5
= n
ette
d, 6
= s
light
net
, 7 =
mod
. sm
ooth
, 8 =
sm
ooth
, 9 =
ver
y sm
ooth
.
Sh
= tu
ber s
hape
: 1 =
roun
d, 2
= m
ostly
roun
d, 3
= ro
und-
oblo
ng, 4
= m
ostly
obl
ong,
5 =
obl
ong,
6 =
obl
ong-
long
, 7 =
mos
tly lo
ng, 8
=
long
, 9 =
cyl
indr
ical
.
TED
= tu
ber e
ye d
epth
: 1 =
ver
y de
ep, 5
= m
ediu
m, 9
= v
ery
shal
low
. TC
S =
tube
r cro
ss s
ectio
n: 1
= v
ery
flat,
5 =
inte
rmed
iate
, 9 =
ver
y ro
und.
2 In
tern
al D
efec
ts: H
H =
hol
low
hea
rt, I
B =
inte
rnal
bro
wni
ng. T
otal
num
ber o
bser
ved
out o
f 12
tube
rs fo
r rep
licat
ed tr
ials
. 0
= no
t obs
erve
d.
1 Tub
er C
hara
cter
istic
s: T
A =
tube
r app
eara
nce:
1 =
ver
y po
or, 5
= fa
ir, 9
= e
xcel
lent
.
Var
iety
/Lin
eT
uber
Cha
ract
eris
tics1
Inte
rnal
Def
ects
2
Res
ons
for P
icko
uts
28
Table 16: Management of Evaluation Trials, 2011
Northampton CountyPlanting Date: 11 MayHarvest Date: 18 OctPrevious Crop: SoybeansFertilizer Rate/A: At planting: 650 lbs/A 13-13-13 (N-P-K)Herbicide: MatrixFungicide: ManzateInsecticide: Admire Pro, Radiant, DimethoateVine Kill: N/ARainfall (inches): May (3.75), June (3.35), July (5.55), August (14.40)Irrigation: N/A
Rock SpringsPlanting Date: 31 MayHarvest Date: 19, 24, 26 Oct and 3 NovPrevious Crop: Wheat followed by mustard green manureFertilizer Rate/A: Pre-plant: 160 lb/A 0-0-60 (N-P-K); at planting: 988 lb/A 10-10-10 (N-P-K)Herbicide: Eptam, Dual II Magnum, Sencor 75DF, MatrixFungicide: 9 applications including Gavel 75DF, Manzate ProStik, Tanos, Bravo WSInsecticide: Mocap EC, Regent, Admire Pro, Baythroid XL, Coragen, AssailVine Kill: 13 and 19 SepRainfall (inches): May (5.52). June (2.62), July (2.18), August (5.60), September (8.82)Irrigation (inches): 7 July (1.80), 13 July (1.20), 21 July (2.00)
29
POTATO (Solanum tuberosum) X.S. Qu and B.J. Christ
Late blight; Phytophthora infestans Department of Plant Pathology
The Pennsylvania State University
University Park, PA 16802
Evaluation of potato cultivars and breeding lines for resistance to late blight, 2011.
In two experiments, seventy-three potato cultivars and advanced breeding lines were evaluated at the Russell E. Larson
Agricultural Research Center at Rock Springs, PA. The soil type was a Hagerstown silty clay loam. The previous crop was wheat.
Potatoes were planted on 21 Jun. The experimental design was a randomized complete block with three replicates in both experiments.
The plots were 4 ft long with five seed pieces planted in each plot and 5 ft breaks between plots within a row. At planting, 700 lb/A of 20-
10-10 (N-P-K) was banded in-the-row. Liquid N fertilizer was applied at 33.0 lb/A on 1 Aug while hilling. Precipitation was 2.62, 2.18,
5.60, and 8.82 in. for Jun, Jul, Aug, and Sep, respectively. On 15 Aug, spreader rows were inoculated with a mixture of four isolates of
Phytophthora infestans, at a concentration of 9.86 × 104 sporangia/ml, to promote a uniform spread of the pathogen to all treatment plots.
Overhead irrigation was applied at 1.20 in. on 6 Jul, 1.00 in. on 14 Jul, and 1.60 in. on 22 Jul. Sprinklers were used daily after inoculation
for 1 hour each day for 24 days to increase humidity in the plant canopy. Disease ratings were determined by visually assessing each 4-ft
plot and estimating the percentage of diseased foliage caused by late blight. Assessments were made on 2, 12, 18 and 23 Sep. Disease data
were expressed as area under the disease progress curve (AUDPC), subjected to analysis of variance, and means separated using Fisher’s
protected least significant difference test (SAS v. 9.1, SAS Institute, Cary, NC).
Kennebec was considered the moderately resistant check for experiment #1; therefore, Yukon Gem, AF3317-15, AF2574-1,
Classic Russet, NY145, NYE106-4, Alpine Russet, Joma, Rio Grande Russet, Snowden, Premier Russet, and Russet Burbank were
considered resistant to moderately resistant. In experiment #2, B0718-3 was the resistant check; therefore, lines AWN86514-2, MSQ176-
5, AF3317-15, B0692-4, A00286-3Y, AF4191-2, AF4122-3, MSR061-1, and AC99375-1RU were considered resistant to moderately
resistant.
Cultivar/Line AUDPCz Cultivar/Line AUDPC Cultivar/Line AUDPC
Experiment #1 Experiment #1 (continued) Experiment #2 (continued)
Yukon Gem ...................... 21.2 my Atlantic ............................. 302.5 efg AF4303-1 ......................... 114.3 l-o
AF3317-15 ....................... 29.0 m Russet Norkotah ............... 313.3 efg LBR7 ................................ 118.5 l-n
AF2574-1 ......................... 63.7 lm BCO01306-2 .................... 315.7 efg A99433-5Y ....................... 132.7 klm
Classic Russet ................... 82.8 klm Chieftain ........................... 316.7 efg AF2574-1 ......................... 133.5 klm
NY145 .............................. 83.5 klm Katahdin ........................... 342.3 d-g BNC202-3 ........................ 154.8 jkl
NYE106-4 ........................ 83.5 klm NY143 .............................. 377.5 def A01010-1 ......................... 161.0 i-l
Alpine Russet ................... 84.3 klm Yukon Gold ...................... 416.5 cde LBR1R2R3R4 .................. 161.8 i-l
Joma ................................. 92.3 j-m Superior ............................ 425.0 cde CO00291-5R .................... 166.8 i-l
Rio Grande Russet ............ 111.8 i-m Modoc .............................. 477.0 cd A99326-1PY .................... 182.7 h-l
Snowden ........................... 128.5 h-m B2152-17 .......................... 538.3 c A00293-2Y ....................... 193.5 g-k
Kennebec .......................... 136.8 h-m Red Sunset ........................ 690.0 b Alpine Russet ................... 197.7 g-k
Premier Russet ................. 139.3 h-m Dark Red Norland ............ 1088.3 a Clearwater Russet ............. 205.2 f-j
Russet Burbank ................ 158.5 h-m LBR5 ................................ 216.8 e-j
AF2866-3 ......................... 202.3 g-l Experiment #2 ATC00293-1W/Y ............. 229.3 e-i
AF0338-17 ....................... 205.0 g-k AWN86514-2 ................... 5.7 q LBR9 ................................ 244.3 e-h
AF3001-6 ......................... 207.7 g-k B0718-3 ............................ 19.0 pq B1992-106 ........................ 261.5 efg
Waneta ............................. 207.8 g-k MSQ176-5 ........................ 25.7 pq A02060-3TE ..................... 270.2 def
NYB13-1 .......................... 218.7 g-k AF3317-15 ....................... 30.2 pq A99331-2RY .................... 276.0 de
Lamoka............................. 226.2 g-j B0692-4 ............................ 47.7 opq A01025-4 ......................... 330.7 cd
AF4040-2 ......................... 230.8 g-j A00286-3Y ....................... 51.5 n-q B2676-2 ............................ 351.2 c
AF4047-2 ......................... 230.8 g-j AF4191-2 ......................... 56.5 n-q A01143-3C ....................... 354.8 c
B1992-106 ........................ 232.3 g-j AF4122-3 ......................... 58.3 n-q B2756-7 ............................ 440.8 b
BNC182-5 ........................ 235.8 ghi MSR061-1 ........................ 66.0 m-q CO01399-10P/Y ............... 453.7 b
AF3362-1 ......................... 239.5 f-i AC99375-1RU ................. 66.8 m-q CO00405-1RF .................. 497.8 ab
NY144 .............................. 255.8 fgh AF4329-7 ......................... 81.8 m-p BNC201-1 ........................ 557.5 a z AUDPC = Area under the disease progress curve was calculated from 2 to 23 Sep according to the formula : ∑n
i=1[(Ri+1 + Ri)/2] [ti+1 – ti],
where R = disease severity rating (% of leaf surface affected) at the ith observation, ti = time (days) since the previous rating at the ith
observation, and n = total number of observations). y Means followed by the same letter within each experiment are not significantly different at P = 0.05 as determined by Fisher’s protected
least significant difference test.
30
POTATO (Solanum tuberosum) X.S. Qu and B.J. Christ
Early blight; Alternaria solani Department of Plant Pathology
The Pennsylvania State University
University Park, PA 16802
Evaluation of potato cultivars and breeding lines for resistance to early blight, 2011.
Thirty-seven potato cultivars and advanced breeding lines were evaluated at the Russell E. Larson
Agricultural Research Center at Rock Springs, PA. The soil type was a Hagerstown silty clay loam. The
previous crop was corn. Entries were planted on 2 Jun in a randomized complete block design with three
replicates. Plots consisted of a single row 4 ft long with five seed pieces planted in each plot with a 4 ft break
between plots. Each entry had an adjacent row of the susceptible cultivar Dark Red Norland. Fertilization was
988 lb/A of 10-10-10 (N-P-K) banded in-the-row at planting. Precipitation was 2.62, 2.18, 5.60, and 8.82 in. for
Jun, Jul, Aug, and Sep, respectively. Overhead irrigation was applied at 1.45 in. on 7 Jul and 1.2 in. on 14 Jul.
On 8 Aug, spreader rows were inoculated with a conidial mixture of three isolates of Alternaria solani, at a
concentration of 1.28 × 105 conidia/ml, to promote a uniform spread of the pathogen to all treatment plots. For
each plot, the percentage of diseased foliage was visually assessed on 18 and 27 Aug, and 3 and 12 Sep. Disease
data were expressed as the area under the disease progress curve (AUDPC), subjected to an analysis of variance
and means separated using Fisher’s protected least significant difference test (SAS v. 9.1, SAS Institute, Cary,
NC).
Twelve cultivars/lines were classified as moderately resistant, and they included: Premier Russet, Russet
Burbank, AF3317-15, BNC182-5, AF3001-6, NYE106-4, B1992-106, Alpine Russet, Rio Grande Russet,
Kennebec, Snowden, and Yukon Gem.
Cultivar/Line AUDPCz Cultivar/Line AUDPC
Premier Russet ................................ 46.0 qy NYB13-1 ........................................ 430.5 g-l
Russet Burbank ............................... 91.7 pq BCO01306-2 ................................... 453.8 f-k
AF3317-15 ...................................... 100.7 opq Superior .......................................... 494.5 f-j
BNC182-5 ....................................... 107.0 opq NYB38-40 ...................................... 497.8 f-j
AF3001-6 ........................................ 114.5 opq Atlantic ........................................... 527.2 f-j
NYE106-4 ....................................... 120.5 opq Chieftain ......................................... 528.7 f-j
B1992-106....................................... 129.5 opq AF4047-2 ........................................ 545.3 f-i
Alpine Russet .................................. 135.5 opq AF2866-3 ........................................ 555.3 f-i
Rio Grande Russet .......................... 156.2 n-q AF3362-1 ........................................ 567.2 f-i
Kennebec ........................................ 172.8 n-q Waneta ............................................ 599.5 fgh
Snowden .......................................... 172.8 n-q Russet Norkotah ............................. 601.3 fg
Yukon Gem ..................................... 220.5 m-q Yukon Gold .................................... 607.0 fg
NY144 ............................................. 244.7 l-p AF4040-2 ........................................ 646.5 ef
JOMA.............................................. 284.5 k-o NY145 ............................................ 811.3 de
Lamoka ........................................... 284.5 k-o Modoc ............................................. 982.8 cd
Classic Russet ................................. 337.5 j-n B2152-17 ........................................ 1020.5 c
Katahdin .......................................... 381.0 i-m Red Sunset ...................................... 1253.3 b
AF2574-1 ........................................ 407.0 h-m Dark Red Norland........................... 1481.7 a
AF0338-17 ...................................... 420.3 g-l z AUDPC = area under the disease progress curve was calculated from 18 Aug to 12 Sep according to the formula
: ∑n
i=1[(Ri+1 + Ri)/2] [ti+1 – ti], where R = disease severity rating (% of leaf surface affected) at the ith
observation, ti = time (days) since the previous rating at the ith observation, and n = total number of
observations). y Means followed by the same letter are not significantly different at P = 0.05 as determined by Fisher’s protected
least significant difference test.
31
POTATO (Solanum tuberosum) X.S. Qu and B.J. Christ
Powdery scab; Spongospora subterranea Department of Plant Pathology
The Pennsylvania State University
University Park, PA 16802
Evaluation of potato cultivars and breeding lines for resistance to powdery scab, 2011.
Thirty-eight potato cultivars and advanced breeding lines were planted in a naturally infested field in
Potter Co., PA on 9 Jun. The soil type was a Mardin silt loam. The previous crop was strawberries. Plots
consisted of 6 ft rows, which were arranged in a randomized complete block design with three replications.
Within each plot, 8 seed pieces were spaced 8-in. apart. Fertilizer was banded in-the-furrow at a rate of 1200
lb/A 8.5-8.5-11.4 (N-P-K) at planting. Precipitation was 3.07, 2.43, 5.06, and 4.23 in. for Jun, Jul, Aug, and Sep,
respectively. Standard crop management procedures and a recommended program for control of early and late
blight were followed. Reglone at 1.0 pt/A was applied as a vine kill on 12 Sep. Tubers were harvested on 25
Oct. The tubers were visually assessed, and the number of tubers with powdery scab was determined from the
total number of tubers per plot. Disease incidence was calculated as the percentage of tubers with powdery scab.
Data was subjected to an analysis of variance test, and means were separated using Fisher’s protected least
significant difference test (SAS v. 9.1, SAS Institute, Cary, NC).
This summer was unusually hot and the powdery scab disease pressure was very low thus making it
difficult to separate cultivars/lines into groups (resistant, moderately resistant, moderately susceptible, and
susceptible). Based on our past years’ data, Kennebec and Shepody should be susceptible, and RioGrande
Russet, Russet Norkotah and Russet Burbank should be moderately resistant. Cultivars and breeding lines with
less powdery scab than Dark Red Norland indicate some level of resistance.
Cultivar/Line
Powdery Scab
Incidence (%)
Cultivar/Line
Powdery Scab
Incidence (%)
Rio Grande Russet .......................... 0.0 cz BCO01306-2 ................................... 3.7 bc
Snowden .......................................... 0.0 c AF2574-1 ........................................ 3.7 bc
AF4047-2 ........................................ 0.0 c AF4040-2 ........................................ 3.7 bc
NY143 ............................................. 0.0 c Classic Russet ................................. 4.0 bc
Premier Russet ................................ 0.8 c Lamoka ............................................ 4.1 bc
AF3362-1 ........................................ 1.0 bc NYB13-1 ......................................... 4.3 bc
NY145 ............................................. 1.1 bc Atlantic ............................................ 4.4 bc
Yukon Gem ..................................... 1.4 bc B2152-17 ......................................... 5.0 bc
Superior ........................................... 1.4 bc Russet Burbank ............................... 6.3 abc
Waneta ............................................ 1.6 bc Shepody ........................................... 6.5 abc
B1992-106....................................... 1.6 bc Yukon Gold ..................................... 6.8 abc
Russet Norkotah .............................. 1.7 bc AF2866-3 ........................................ 7.3 abc
BNC182-5 ....................................... 2.2 bc NYE106-4 ....................................... 7.4 abc
AF3001-6 ........................................ 2.3 bc NY144 ............................................. 7.6 abc
Alpine Russet .................................. 2.4 bc Katahdin .......................................... 9.0 abc
AF0338-17 ...................................... 2.5 bc Red Sunset ....................................... 11.1 abc
AF3317-15 ...................................... 2.8 bc Joma ................................................ 12.8 ab
Chieftain ......................................... 3.1 bc Kennebec ......................................... 17.5 a
Dark Red Norland ........................... 3.4 bc Modoc ............................................. 18.1 a z Means followed by the same letter are not significantly different at P = 0.05 as determined by Fisher’s protected
least significant difference test.
32
POTATO (Solanum tuberosum ‘Atlantic’) X.S. Qu, M.W. Peck, and B.J. Christ
Late blight; Phytophthora infestans Department of Plant Pathology
The Pennsylvania State University
University Park, PA 16802
Evaluation of fungicides for control of potato late blight, 2011.
Fungicides were evaluated on potato cv. ‘Atlantic’ at the Russell E. Larson Agricultural Research Center
at Rock Springs, PA. The soil type was a Hagerstown silty clay loam. The previous crop was wheat. Potatoes
were planted on 23 Jun. The experimental design was a randomized complete block with four replicates. Plots
were three rows wide (36 in. spacing between rows) and 10 ft long with 8 in. seed piece spacing. Fertilization
was 700 lb/A of 20-10-10 (N-P-K) banded in-the-row at planting. Liquid N fertilizer was applied at 33.0 lb/A on
1 Aug while hilling. Precipitation was 2.62, 2.18, 5.60, and 8.82 in. for Jun, Jul, Aug, and Sep, respectively.
Spreader rows were inoculated with the late blight pathogen on 15 Aug. A mixture of four isolates of
Phytophthora infestans, with a concentration of 9.86 × 104 sporangia/ml, was used to promote a uniform spread of
the pathogen to all treatment plots. Overhead irrigation was applied at 1.20 in. on 6 Jul, 1.00 in. on 14 Jul, and
1.60 in. on 22 Jul. Sprinklers were used daily after inoculation for 1 hour each day for 24 days to increase
humidity in the plant canopy. Fungicides were applied with a tractor-mounted, N2-pressurized side boom sprayer
at 30 psi and 45 gal/A. The spray boom was equipped with drop nozzles and boom nozzles so that both sides and
the top of each plant were uniformly sprayed. Disease ratings were determined by visually assessing the middle
row of each plot for the percentage of diseased foliage caused by late blight. The plots were rated on 2, 12, 18, 23
and 28 Sep and the assessments were used to calculate the area under the disease progress curve (AUDPC).
Disease data were subjected to analysis of variance and Fisher’s protected least significant difference test (SAS v.
9.1, SAS Institute, Cary, NC).
All of the treatments significantly suppressed season-long foliar late blight compared to the untreated
control. Treatments with Bravo Weather Stik, Gavel, GWN-4700 + GWN-9941, GWN-4700 + GWN-9938 and
Bravo Weather Stik alternated with Zampro had the lowest levels of foliar late blight.
Treatment and rate of product per acre (application timingz) AUDPC
y
Untreated Control ............................................................................................................... 580.5 ax
Bravo Weather Stik 6SC 1.5 pt (A, B, C, D, E, F) ............................................................. 87.5 efg
GAVEL 75DF 2.0 lb (A, B, C, D, E, F) ............................................................................. 82.3 efg
GWN-4700 80WP 3.4 oz + GWN-9941 6SC 21.3 oz (A, B, C, D, E, F) .......................... 59.8 fg
GWN-4700 80WP 2.7 oz + GWN-9938 4.2SC 41.0 oz (A, B, C, D, E, F) ....................... 63.0 fg
GWN-4700 80WP 3.4 oz + GWN-10043 90DF 17.8 oz (A, B, C, D, E, F) ...................... 98.9 def
GAVEL 75DF 2.0 lb (A, C, E) alt.
GWN-9938 4.2SC 64.0 oz (B, D, F) ........................................................................... 150.9 c
Bravo Weather Stik 6SC 1.5 pt (A, C, E) alt.
Zampro 11.0 fl oz (B, D, F) ......................................................................................... 53.0 g
Bravo Weather Stik 6SC 1.5 pt (A, C, E) alt.
Manzate 2.0 lb (B, D, F) .............................................................................................. 118.6 cde
Regalia 1.0 qt + Tanos 50W 2.75 oz (A, B, C, D, E, F) ..................................................... 135.9 cd
Regalia 1.0 qt + Kocide 3000 1.75 lb (A, B, C, D, E, F).................................................... 252.6 b z Dates of fungicide applications were as follows: A =Aug 10; B = Aug 17; C = Aug 24; D = Aug 31; E = Sep 12; F = Sep
21; we did not spray for the week of Sep 5-9 because of rain every day that week. y AUDPC = Area under disease progress curve was calculated from 2 to 28 Sep according to the formula : ∑
n i=1[(Ri+1 + Ri)/2]
[ti+1 – ti], where R = disease severity rating (% of leaf surface affected) at the ith observation, ti = time (days) since the
previous rating at the ith observation, and n = total number of observations).
x Means followed by the same letter are not significantly different at P = 0.05 as determined by Fisher’s protected least
significant difference test.
33
POTATO (Solanum tuberosum ‘Atlantic’) X.S. Qu, M.W. Peck, and B.J. Christ
Early blight; Alternaria solani Department of Plant Pathology
The Pennsylvania State University
University Park, PA 16802
Evaluation of fungicides for control of potato early blight, 2011.
Fungicides were evaluated for managing early blight on potato cv. ‘Atlantic’ at the Russell E. Larson
Agricultural Research Center at Rock Springs, PA. The soil type was a Hagerstown silty clay loam. The
previous crop was corn. Potatoes were planted on 2 Jun. The experimental design was a randomized complete
block with four replicates. Plots were three rows wide (36 in. spacing between rows) and 10 ft long with 8 in.
seed piece spacing. Fertilization was 988 lb/A of 10-10-10 banded in-the-row at planting. Precipitation was 2.62,
2.18, 5.60, and 8.82 in. for Jun, Jul, Aug, and Sep, respectively. Overhead irrigation was applied at 1.45 in. on 7
Jul and 1.2 in. on 14 Jul. Spreader rows were inoculated on 8 Aug. A mixture of three isolates of Alternaria
solani, with a concentration of 1.28 × 105 conidia/ml, was used to promote a uniform spread of the pathogen to all
treatment plots. Fungicides were applied with a tractor-mounted, N2-pressurized side boom sprayer at 30 psi and
45 gal/A. The spray boom was equipped with drop nozzles and boom nozzles so that both sides and the top of
each plant were uniformly sprayed. On 18 and 27 Aug and 3, 12, 19 and 26 Sep each plot was visually assessed
for the percentage of diseased foliage caused by early blight. The six visual assessments of early blight infection
were used to calculate the area under disease progress curve (AUDPC). Disease data were subjected to analysis
of variance and Fisher’s protected least significant difference test (SAS v. 9.1, SAS Institute, Cary, NC).
All treatments significantly reduced season-long early blight compared to the untreated control, except for
CX-10440 at the rate of 3.75 oz/A.
Treatment and rate of product per acre (application timingz) AUDPC
y
Untreated Control ............................................................................................................... 922.6 ax
Bravo Weather Stik 6SC 1.5 pt (A, B, C, D, E, F, G) ........................................................ 442.9 cd
Cabrio Plus 2.0 lb (A, B, C, D, E, F, G) ............................................................................. 212.9 de
Cabrio Plus 2.9 lb (A, B, C, D, E, F, G) ............................................................................. 118.1 e
CX-10440, Polyoxin D 5% SC 7.5 oz (A, C, E, G)............................................................ 556.3 bc
CX-10440, Polyoxin D 5% SC 3.75 oz (A, C, E, G).......................................................... 755.9 ab
Bravo Weather Stik 6SC 1.5 pt (A, C, E, G)
Luna Tranquility 11.2 oz (B, D, F)
Reason 500SC 5.5 oz (C)
Scala 60SC 7.0 oz (G) ..................................................................................... 165.3 e
Bravo Weather Stik 6SC 1.5 pt (A, C, E, G)
Luna Tranquility 8.0 oz (B, D, F)
Reason 500SC 5.5 oz (C)
Scala 60SC 7.0 oz (G) ..................................................................................... 139.3 e
Priaxor 500SC 4.0 fl oz (A, B, C, D, E, F, G) .................................................................... 200.3 de
Priaxor 500SC 6.0 fl oz (A, B, C, D, E, F, G) .................................................................... 235.8 de
Endura 70WG 3.5 oz (A, B, C, D, E, F, G) ........................................................................ 367.6 cde
Headline SC 6.0 fl oz (A, B, C, D, E, F, G) ....................................................................... 299.5 cde z Dates of fungicide applications were as follows: A = Aug 4; B = Aug 11; C = Aug 18; D = Aug 26; E = Sep 2; F
= Sep 12; G = Sep 20; we did not spray for the week of Sep 5-9 because of rain every day that week. y AUDPC = Area under disease progress curve was calculated from 18 Aug to 26 Sep according to the formula :
∑n
i=1[(Ri+1 + Ri)/2] [ti+1 – ti], where R = disease severity rating (% of leaf surface affected) at the ith observation,
ti = time (days) since the previous rating at the ith observation, and n = total number of observations).
x Means followed by the same letter are not significantly different at P = 0.05 as determined by Fisher’s protected
least significant difference test.