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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. Grey Professor and Associate Professor Department of Crop & Soil Sciences. APRES 2010. Peanut Production. Very important to southern region Minor crop to rest of country

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

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  1. Weed Control Programs in Peanut with Reflex, Sharpen, and Spartan Eric P. Prostko and Timothy L. Grey Professor and Associate Professor Department of Crop & Soil Sciences APRES 2010

  2. 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

  3. Potential New Peanut Herbicides?

  4. Spartan (Sulfentrazone) in Peanut • F-6285 • Crop injury and cotton rotations were the big issues • Had a label in 2004 then????

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

  6. Materials and Methods Locations

  7. 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

  8. Stages of growthPOST Timing

  9. Results

  10. Peanut Stunting (%) –TiftonJune 23 (25 DAT) LSD 0.10 = 6

  11. Peanut Stunting (%) –TiftonJuly 23 (55 DAT) LSD 0.10 = 7

  12. Peanut Leaf Burn (%) – PlainsJune 11 (27 DAT) LSD 0.10 = 4

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

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

  15. Palmer Amaranth Control (%) –TiftonJune 23 (25 DAT) LSD 0.10 = 2

  16. Palmer Amaranth Control (%) – PlainsJune 11 (27 DAT) LSD 0.10 = 6

  17. Annual MG Control (%) –TiftonJune 23 (25 DAT) LSD 0.10 = 5

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

  19. Strongarm Based Program Prowl H2O @ 34 oz/A – PRE Strongarm 84WG @ 0.45 oz/A – PRE Cadre 2AS @ 4 oz/A – POST (29 DAP) Agrioil @ 1% v/v – POST (29 DAP) NTC PE-14-09 July 23 56 DAP

  20. Valor Based Program Prowl H2O @ 34 oz/A – PRE Valor 51WG @ 3 oz/A – PRE Cadre 2AS @ 4 oz/A – POST (29 DAP) Agrioil @ 1% v/v – POST (29 DAP) NTC PE-14-09 July 23 56 DAP

  21. Strongarm/Valor Based Program NTC Prowl H2O @ 34 oz/A – PRE Strongarm 84WG @ 0.23 oz/A - PRE Valor 51WG @ 1.5 oz/A – PRE Cadre 2AS @ 4 oz/A – POST (29 DAP) Agrioil @ 1% v/v – POST (29 DAP) PE-14-09 July 23 56 DAP

  22. Spartan Based Program NTC Prowl H2O @ 34 oz/A – PRE Spartan 4F @ 5 oz/A – PRE Cadre 2AS @ 4 oz/A – POST (29 DAP) Agrioil @ 1% v/v – POST (29 DAP) PE-14-09 July 23 56 DAP

  23. Reflex Based Program NTC Prowl H2O @ 34 oz/A – PRE Reflex 2SL @ 16 oz/A – PRE Cadre 2AS @ 4 oz/A – POST (29 DAP) Agrioil @ 1% v/v – POST (29 DAP) PE-14-09 July 23 56 DAP

  24. Sharpen Based Program - 1 NTC Prowl H2O @ 34 oz/A – PRE Sharpen 2.85SC @ 1 oz/A – PRE Cadre 2AS @ 4 oz/A – POST (29 DAP) Agrioil @ 1% v/v – POST (29 DAP) PE-14-09 July 23 56 DAP

  25. Sharpen Based Program - 2 NTC Prowl H2O @ 34 oz/A – PRE Sharpen 2.85SC @ 2 oz/A – PRE Cadre 2AS @ 4 oz/A – POST (29 DAP) Agrioil @ 1% v/v – POST (29 DAP) PE-14-09 July 23 56 DAP

  26. Florida Beggarweed Control (%) – PlainsAugust 1 (80 DAT) LSD 0.10 = 14

  27. Plains – August 1 Prowl H2O @ 34 oz/A – PRE Reflex 2SL @ 12 oz/A – PRE Cadre 2AS @ 4 oz/A – POST (27 DAP) Agrioil @ 1% v/v – POST (27 DAP) NTC

  28. Peanut Yield (lbs/A) - Tifton LSD 0.10 = 455 CV = 7.32

  29. 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

  30. 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.

  31. 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

  32. Sharpen 2.85SC @ 2 oz/A - 2010 PE-17-10 June 8 (26 DAT)

  33. 229-392-1034 (cell) eprostko@uga.edu www.gaweed.com Questions?

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