weed control programs in peanut with reflex, sharpen, and spartan

Weed Control Programs in Peanut with Reflex, Sharpen, and Spartan

Eric P. Prostko and Timothy L. GreyProfessor and Associate ProfessorDepartment of Crop & Soil Sciences

APRES 2010

Peanut Production

• Very important to southern region

• Minor crop to rest of country– 1,201,000 planted

acres in 2010

• Limited R&D for weed control

Potential New Peanut Herbicides?

Spartan (Sulfentrazone) in Peanut

• F-6285

• Crop injury and cotton rotations were the big issues

• Had a label in 2004 then????

Objective

• To evaluate the potential use of Spartan, Reflex, and Sharpen for weed control in peanut.

Materials and Methods Locations

Tifton Plains

Planting Date

May 28, 2009

May 12, 2009

Variety GA-06G GA-06G

PRE May 29 May 12

POST June 26

(29 DAP)

June 11

(30 DAP)

pH 6.0 6.1

OM (%) 1.53 1

Sand (%) 96 71

Silt (%) 0 13

Clay (%) 4 16

Materials and MethodsTreatments

• All programs included– Prowl H2O 3.8SC @ 2.1 pt/A (PRE)

– Cadre 2AS @ 4 oz/A + Agrioil @ 1% v/v (POST)

• Strongarm 84WG (SG)– 0.45 oz/A

• Valor 51WG (V)– 3 oz/A

• SG + V– 0.23 oz/A + 1.5 oz/A (1/2X rates)

• Spartan 4F (SP)– 4, 5, 6, 8 oz/A

• Reflex 2SL (R)– 12 and 16 oz/A

• Sharpen 2.85SC (SH)– 1 and 2 oz/A

Stages of growthPOST Timing

Tifton Plains

Peanut 4” tall

R1-R2

6” tall

Palmer

Amaranth

3-12” 2-8”

Annual

MG

3-6” --

Florida

Beggarweed

-- 1”

Results

Peanut Stunting (%) –TiftonJune 23 (25 DAT)

LSD 0.10 = 6

Peanut Stunting (%) –TiftonJuly 23 (55 DAT)

LSD 0.10 = 7

Peanut Leaf Burn (%) – PlainsJune 11 (27 DAT)

LSD 0.10 = 4

Spartan 4F @ 8 oz/A InjuryJune 23 (25 DAT)

Tifton

Sharpen 2.85SC @ 2 oz/A InjuryJune 23 (25 DAT)

Tifton

Palmer Amaranth Control (%) –TiftonJune 23 (25 DAT)

LSD 0.10 = 2

Palmer Amaranth Control (%) – PlainsJune 11 (27 DAT)

LSD 0.10 = 6

Annual MG Control (%) –TiftonJune 23 (25 DAT)

LSD 0.10 = 5

Spartan 4F @ 4 oz/AJune 23 (25 DAT)

Strongarm Based Program

NTCProwl H2O @ 34 oz/A – PRE

Strongarm 84WG @ 0.45 oz/A – PRECadre 2AS @ 4 oz/A – POST (29 DAP)

Agrioil @ 1% v/v – POST (29 DAP)

PE-14-09July 2356 DAP

Valor Based Program

NTCProwl H2O @ 34 oz/A – PREValor 51WG @ 3 oz/A – PRE

Cadre 2AS @ 4 oz/A – POST (29 DAP)Agrioil @ 1% v/v – POST (29 DAP)

PE-14-09July 2356 DAP

Strongarm/Valor Based Program

NTC Prowl H2O @ 34 oz/A – PREStrongarm 84WG @ 0.23 oz/A - PRE

Valor 51WG @ 1.5 oz/A – PRECadre 2AS @ 4 oz/A – POST (29 DAP)

Agrioil @ 1% v/v – POST (29 DAP)

PE-14-09July 2356 DAP

Spartan Based Program

NTC Prowl H2O @ 34 oz/A – PRESpartan 4F @ 5 oz/A – PRE

Cadre 2AS @ 4 oz/A – POST (29 DAP)Agrioil @ 1% v/v – POST (29 DAP)

PE-14-09July 2356 DAP

Reflex Based Program

NTC Prowl H2O @ 34 oz/A – PREReflex 2SL @ 16 oz/A – PRE

Cadre 2AS @ 4 oz/A – POST (29 DAP)Agrioil @ 1% v/v – POST (29 DAP)

PE-14-09July 2356 DAP

Sharpen Based Program - 1

NTC Prowl H2O @ 34 oz/A – PRESharpen 2.85SC @ 1 oz/A – PRE

Cadre 2AS @ 4 oz/A – POST (29 DAP)Agrioil @ 1% v/v – POST (29 DAP)

PE-14-09July 2356 DAP

Sharpen Based Program - 2

NTC Prowl H2O @ 34 oz/A – PRESharpen 2.85SC @ 2 oz/A – PRE

Cadre 2AS @ 4 oz/A – POST (29 DAP)Agrioil @ 1% v/v – POST (29 DAP)

PE-14-09July 2356 DAP

Florida Beggarweed Control (%) – PlainsAugust 1 (80 DAT)

98 98 99

91

99 97 99

57

36

9298

0

20

40

60

80

100

SG V SG/V SP4 SP5 SP6 SP8 R12 R16 SH1 SH2

LSD 0.10 = 14

Plains – August 1

NTC Prowl H2O @ 34 oz/A – PREReflex 2SL @ 12 oz/A – PRE

Cadre 2AS @ 4 oz/A – POST (27 DAP)Agrioil @ 1% v/v – POST (27 DAP)

Peanut Yield (lbs/A) - Tifton

LSD 0.10 = 455CV = 7.32

Summary - I

• Peanut Injury (Tifton)– Spartan (8 oz/A), Reflex and Sharpen

caused the most peanut injury.

• Peanut Injury (Plains)– Spartan (6 or 8 oz/A) caused the most

peanut injury. No injury from Reflex or Sharpen at this location.

• Palmer amaranth control was ≥ 92% with all treatments.– All treatments also included Prowl

Summary - II• Spartan @ 4 and 5 ozs/A and Reflex provided less

residual control of annual morningglory.

• Reflex provided less residual control of Florida beggarweed.

• Peanut Yield (Tifton)– When compared to the highest yielding

treatments, applications of Spartan @ 8 oz/A, Reflex, and Sharpen resulted in lower yields.

• Peanut Yield (Plains)– No data collected due to excessive weather.

Conclusions• Reflex

– Will not be pursued by Syngenta– Rotation restriction for peanut changed to 14 days

• 10 months on current label

• Sharpen– Too much injury at 2 oz/A!– Reduced weed control at 1 oz or less?

• Spartan– Spartan Charge was labeled in 2010

• 3-3.75 oz/A (coarse soils, <1.5% OM)• 3.75 oz/A = Aim 2EC @ 0.65 oz/A + Spartan 4F @ 2.9 oz/A

– Length of residual control at reduced rates particularly FL beggarweed and tropic croton?

– Cotton rotation restriction – 12 months

Sharpen 2.85SC @ 2 oz/A - 2010

PE-17-10June 8 (26 DAT)

229-392-1034 (cell)eprostko@uga.eduwww.gaweed.com