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Peanut Weed Control Update 2010 (County Extension Agents)

This update discusses innovative weed control methods in peanuts, focusing on the 2009 labeling of Fusilade, its comparisons to other herbicides like Poast and Select, and efficacy against grass weeds such as Bermudagrass and crabgrass. It delves into peanut yield responses to Reflex and Valor applications and emphasizes the importance of starting with a clean field and using residual herbicides. With insights on pigweed control, application timing, and the impacts of water volume on peanut injury, this guide provides essential strategies for effective weed management.

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Peanut Weed Control Update 2010 (County Extension Agents)

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  1. Peanut Weed Control Update2010(County Extension Agents) Eric P. Prostko Extension Weed Specialist Department of Crop & Soil Sciences The University of Georgia

  2. New Stuff

  3. Fusilade in Peanuts • Finally Labeled in 2009 • How does it compare to Poast (P) or Select (S)??? • Grass Weeds • Bermudagrass (F=S>P) • B. signalgrass (P=S>F) • Goosegrass (F=P=S) • TX panicum (P=S>F) • Crabgrass (P=S>F) • Bristly starbur control?

  4. Fusilade/Bristly Starbur Source: Dr. Greg MacDonald University of Florida

  5. Reflex in Peanuts

  6. Peanut Yield Response to Reflex (R) and Valor (V) PE-08-09 Averaged over 3 varieties (GA Green, GA-06G, GA-07W) Weed-free LSD 0.10 = 185

  7. New Variety Concerns • GA-06G • Florida-07

  8. Gramoxone Inteon @ 8.0 oz/A80/20 @ 0.25% v/v7 DAT FL-07 GA-06G

  9. Gramoxone Inteon @ 8.0 oz/A80/20 @ 0.25% v/v7 DAT GA-06G FL-07

  10. Classic and GA-06G (2008) * 0.5 oz/A 80/20 P = 0.0843 LSD 0.10 = 343

  11. Classic and GA-06G (2009) * 0.5 oz/A 80/20 P = 0.0607 LSD 0.10 = 572

  12. Classic and FL-07 (2009) * 0.5 oz/A 80/20 P = 0.0767 LSD 0.10 = 297

  13. Herbicide/Fungicide Tank-Mixes

  14. Elast • 2009 Field Trial • Cadre • Ultra Blazer • Cobra • 2,4-DB • Select Max • No major problems • only 1 trial so far Cadre Cadre + Elast

  15. Influence of water volume on peanut injury caused by Provost (10 oz/A) + 2,4-DB (18 oz/A) – 4 DAT 15 GPA 10 GPA GA-06G (21 DAP) Application Time of Day: 8:30 am Air Temp = 85 F RH = 77%

  16. A Bad Idea! Headline + Cadre + Strongarm + 2,4-DB + Dyne-Amic

  17. Cobra @ 12.5 oz/A + 1% COC Cobra @ 12.5 oz/A + Provost @ 8 oz/A Cobra @ 12.5 oz/A + Provost @ 8 oz/A + 1% COC 1 DAT

  18. Pigweed

  19. Pigweed Control is not impossible!!!!! Somewhere in SW Georgia September 2009

  20. Prostko’s Picks for Pigweed • Irrigated or Dryland! • Start Clean! • Use a residual! • POST treatments when 3” tall or less • Remove escapes before seed production • Think About the Future

  21. May Rainfall – CPES Tifton1996-2009 8 of 14 years (57%) less than average rainfall

  22. May Rainfall – Statesboro1996-2009 9 of 14 years (64%) less than average rainfall

  23. 6 hours 4 days 19 days 7 days Palmer Amaranth Control with Gramoxone Inteon 2SL @ 2.5 pt/A + 80/20 @ 0.25% v/v AMAPA Height Low = 8” High = 23” Average = 17”

  24. Palmer amaranth control is not impossible! 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

  25. NTC Gramoxone Inteon 2SL @ 12 oz/A Storm 4SL @ 24 oz/A 80/20 @ 0.25% v/v Applied 21DAP PE-11-09 July 1 22 DAT

  26. Valor Injury @ (6 oz/A) 16 DAT PE-05-09 May 22, 2009

  27. Peanut Yield Response to Valor - 2009 PE-08-09 Averaged over 3 varieties (GA Green, GA-06G, GA-07W) Weed-free LSD 0.10 = 185

  28. Valor Response to Tillage. Macon Co., 2009 at 49 DAT Valor 2 oz applied prior to strip tillage Valor 2 oz applied after to strip tillage

  29. Ropewick vs. WeedWiperPonder Farm, 2009 ****Roller applicator was first mentioned in literature in 1977. Wyse, D.L and C. Habstritt. 1977. A roller herbicide applicator. Proc. North Cent. Weed Control Conf. 32:144-145.

  30. Ropewick vs. WeedWiper – II9 DAT NTC Ropewick WeedWiper 50% solution of Gramoxone Inteon + 80/20 @ 0.25% v/v AMAPA Height at Application: Low = 28”, High = 62”, Average = 37”

  31. Gramoxone Inteon 2SL 50% solution 80/20 @ 0.25% v/v Cobra 2EC 50% solution 80/20 @ 0.25% v/v NTC WeedWiper Test – III7 DAT Pigweed-04-09 09/15/09 Rep 3

  32. A long-term resistance plan?

  33. Cutleaf Eveningprimrose Control21 DAT 2,4-DB 1.75SL @ 16 oz/A Agridex @ 1% v/v 99% Visual Control 85% Biomass Reduction Cobra 2EC @ 12.5 oz/A Agridex @ 1% v/v 80% Visual Control 73% Biomass Reduction Applied: 7” tall 11” diameter Bud stage

  34. For More Weed Science Info www.gaweed.com

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