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)[email protected]