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Peanut Weed Management Update

Peanut Weed Management Update. Eric P. Prostko Extension Weed Specialist Department of Crop & Soil Sciences The University of Georgia Tifton. Extension Agent Training - March 2006. 2005 ALS-Resistant Pigweed Survey 60 locations, 21 counties. As of March 1, 2006 Preliminary data

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Peanut Weed Management Update

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  1. Peanut Weed Management Update Eric P. Prostko Extension Weed Specialist Department of Crop & Soil Sciences The University of Georgia Tifton Extension Agent Training - March 2006

  2. 2005 ALS-Resistant Pigweed Survey60 locations, 21 counties • As of March 1, 2006 • Preliminary data • 1573 plants treated • 1395 plants survived (89%) • ≥ 90% survival • 30 locations = 50% • 80-89% survival • 23 locations = 38% • 70-79% survival • 5 locations = 8% • 60-69% survival • 1 location = 2% • Jefferson County • 50-59% survival • 1 location = 2% • Laurens County

  3. Herbicide Programs for ALS-Resistant Pigweed Management in Peanut *Generic formulations of Dual Magnum and Outlook are available.

  4. Research Questions? • Do herbicides influence peanut seed germination? • How does Classic effect AP-3? • Can I put Prowl over-the-top of emerged peanuts? • Herbicide/fungicide tank-mixes? • Do I really need Gramoxone? • How about eclipta? • Does Cobra reduce peanut yields? • What does 2,4-D do to peanut yields?

  5. Herbicide Effects on Peanut Seed Germination, 2005. (@ 250C or 770F) Averaged over 3 varieties (GA Green, C-99R, GA-01R); Cadre @ 1.44 oz/A; 2,4-DB @ 1.1 pt/A

  6. Research Questions? • Do herbicides influence peanut seed germination? • How does Classic effect AP-3? • Can I put Prowl over-the-top of emerged peanuts? • Herbicide/fungicide tank-mixes? • Do I really need Gramoxone? • How about eclipta? • Does Cobra reduce peanut yields? • What does 2,4-D do to peanut yields?

  7. Classic Effects on Peanut Yield– 2005 Classic @ 0.5 ozs/A + Activator 90 @ 0.25% v/v Planted: May 2 AP-3 Twin row Conventional tillage 3 seed/ft Phorate 6’ X 100’ plots, 3 reps Weed-free P = 0.5931

  8. Research Questions? • Do herbicides influence peanut seed germination? • How does Classic effect AP-3? • Can I put Prowl over-the-top of emerged peanuts? • Herbicide/fungicide tank-mixes? • Do I really need Gramoxone? • How about eclipta? • Does Cobra reduce peanut yields? • What does 2,4-D do to peanut yields?

  9. Peanut Yield Response to Delayed Prowl Timings - 2004 P = 0.198 Averaged over two formulations (Prowl and Prowl H2O applied at 1.00 lb ai/A)

  10. Peanut Yield Response to Prowl EC Timings - 2005 LSD 0.05 = 397 LSD 0.10 = 326 1.0 lb ai/A

  11. Peanut Yield Response to Prowl H2O Timings - 2005 * * LSD 0.05 = 397 LSD 0.10 = 326 1.0 lb ai/A

  12. Research Questions? • Do herbicides influence peanut seed germination? • How does Classic effect AP-3? • Can I put Prowl over-the-top of emerged peanuts? • Herbicide/fungicide tank-mixes? (handout) • Do I really need Gramoxone? • How about eclipta? • Does Cobra reduce peanut yields? • What does 2,4-D do to peanut yields?

  13. Cadre @ 1.44 ozs/A Headline @ 9 ozs/A Dual Magnum @ 1.33 pts/A AMS @ 1 lb/A COC @ 1 qt/A

  14. Research Questions? • Do herbicides influence peanut seed germination? • How does Classic effect AP-3? • Can I put Prowl over-the-top of emerged peanuts? • Herbicide/fungicide tank-mixes? • Do I really need Gramoxone? • How about eclipta? • Does Cobra reduce peanut yields? • What does 2,4-D do to peanut yields?

  15. Do you need Gramoxone? Gramoxone Max @ 8 ozs/A + Pledge @ 8 ozs/A + NIS @ 0.25% v/v (15 DAP) Fb Cadre @ 1 oz/A + COC @ 1% v/v (28 DAP) Untreated Cadre @ 1 oz/A + COC @ 1% v/v (28 DAP) PE-07-05 July 18, 2005 (69 DAP) Ponder Farm

  16. Gramoxone + Cadre - 2005 P = 0.10 Gramoxone Inteon @ 12 ozs/A + Basagran @ 8 ozs/A + NIS @ 0.25% v/v = $7.08/A + $4.00/A = $11.08/A $11.08/$0.1775 = 62.4 lbs of peanuts

  17. Research Questions? • Do herbicides influence peanut seed germination? • How does Classic effect AP-3? • Can I put Prowl over-the-top of emerged peanuts? • Herbicide/fungicide tank-mixes? • Do I really need Gramoxone? • How about eclipta? • Does Cobra reduce peanut yields? • What does 2,4-D do to peanut yields?

  18. Eclipta

  19. Eclipta Control in Peanut Strongarm @ 0.45 ozs/A NIS @ 0.25% v/v 20 DAT Untreated

  20. What weeds does Strongarm control POST? • common ragweed • common cocklebur • horseweed • bristly starbur • morningglory • wild radish • eclipta • tropical spiderwort • Label • TSW suppression • up to 30 DAC • NIS • 18 month cotton rotation

  21. Common Ragweed Treated with Strongarm @ 0.30 ozs/A + NIS @ 0.25% v/v Before 6 DAT Lanier County 2005 19 DAT

  22. Research Questions? • Do herbicides influence peanut seed germination? • How does Classic effect AP-3? • Can I put Prowl over-the-top of emerged peanuts? • Herbicide/fungicide tank-mixes? • Do I really need Gramoxone? • How about eclipta? • Does Cobra reduce peanut yields? • What does 2,4-D do to peanut yields?

  23. Cobra Effects on Peanut Yield – 2005Cobra @ 12.5 ozs/A + Herbimax @ 1% v/v a a a ab ab bc Planted: May 5 GA Green Twin row Conventional tillage 3 seed/ft Phorate No Classic Weed-free

  24. Research Questions? • Do herbicides influence peanut seed germination? • How does Classic effect AP-3? • Can I put Prowl over-the-top of emerged peanuts? • Herbicide/fungicide tank-mixes? • Do I really need Gramoxone? • How about eclipta? • Does Cobra reduce peanut yields? • What does 2,4-D do to peanut yields?

  25. What does 2,4-D do to peanut yield? GA Green Ponder Farm 2005

  26. How do the top growers control weeds? • 2005 Peanut Achievement Club • 21 farms • 4356 lbs/A • State average was only 2870 lbs/A • Weed Control Tactics • Conventional tillage • 76% use bottom plow • Twin rows (71%) • Sonalan (81%) • Strongarm or Valor • 38% vs. 43% • Cadre (76%)

  27. www.gaweed.com

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