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2007 Peanut Weed Management Update for County Agents

2007 Peanut Weed Management Update for County Agents. Eric P. Prostko Extension Weed Specialist Department of Crop & Soil Sciences The University of Georgia. Extension Agent Training – December 2006. Changes in 2007 Pest Control Handbook – Peanut Weed Control.

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2007 Peanut Weed Management Update for County Agents

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  1. 2007 Peanut Weed Management Update for County Agents Eric P. Prostko Extension Weed Specialist Department of Crop & Soil Sciences The University of Georgia Extension Agent Training – December 2006

  2. Changes in 2007 Pest Control Handbook – Peanut Weed Control • Added Firestorm (generic paraquat) where appropriate • Included Aim in burndown sections • Added generic metolachlors but still included the following warning: The generic formulations of metolachlor (Parallel, Stalwart, Me-Too-Lachlor) have not provided the same length of residual control of certain weeds as similar rates of Dual Magnum formulations in some UGA field trials. • Added a specific control rec for tropical spiderwort • Table for ALS/GR-resistant pigweed control • Added Propel (generic Outlook) • Zorial to Solicam

  3. Firestorm • Chemtura • Great Lakes Chemical Corp. + Crompton Corp. • 3 lb/gallon of paraquat • Similar formulation as Gramoxone Max • 5.4 to 10.8 ozs/A = normal rates

  4. preplant burndown up to 24 hours after planting • Up to 2 ozs/A • $5.00/oz • Tank-mix with glyphosate

  5. IMPOSE • Generic liquid Cadre • From Makhteshim Agan of North America (MANA)

  6. How/Why do we let pigweeds get this big????

  7. Will these herbicides control large pigweeds?

  8. Cobra 2EC @ 12.5 ozs/A + COC @ 1% v/v applied to 17” tall pigweed 4 DAT 1 DAT 7 DAT 16 DAT

  9. Cadre @ 4 ozs/A + 2,4-DB @ 1.1 pt/A + COC @ 1% v/v – 34 DAT Applied to 17” tall pigweed

  10. 2,4-DB/Cobra Test – 2006 2,4-DB 1.75SL @ 1.1 pt/A + Agrioil @ 1% v/v (POST) fb Cobra 2EC @ 12.5 oz/A Agrioil @ 1% v/v POST2 Untreated Cobra 2EC @ 12.5 oz/A Agrioil @ 1% v/v POST POST: June 5 (17” tall pigweed) POST2: June 9 Photos taken 24 days after POST application

  11. Palmer Amaranth Control with Cobra and 2,4-DB Cobra @ 12.5 ozs/A 2,4-DB @ 1.1 pts/A COC @ 1% v/v Applied to 17” tall pigweed

  12. How do we manage ALS-resistant Palmer amaranth? • Need to start using more PRE’S • Valor, Dual Magnum/generics, Outlook • Goal????? • POST Herbicides • Timeliness • Cobra, Ultra Blazer, Paraquat • Over reliance on PPO’s • Will need both PRE’s and POST’s • Increased production costs

  13. GR-Pigweed/Soybean Test – II (2006)7 WAP RUWM (POST) Valor @ 2 oz/A (PRE) RUWM (POST) Untreated

  14. What if we do not control Palmer amaranth?

  15. Does Cobra reduce yields??

  16. Peanut (GA Green) Response to Cobra78 DAP - 2006 4003 lbs/A – Tifton 4319 lbs/A - Plains 3556 lbs/A – Tifton 4450 lbs/A - Plains Untreated Cobra @ 12.5 ozs/A Agrioil @ 1% v/v Applied 30 DAP

  17. Classic Use in GA Peanuts

  18. Classic @ 0.5 ozs/A Applied 62 DAE GA-02C AP-3 7 DAT

  19. 31 data points 77% ≤ 8% 23% > 8% 11 weed-free field trials in GA

  20. Classic Effects on Peanut Yield - 2006 (P = 0.66) (P = 0.37) Classic @ 0.5 oz/A + 80/20 @ 0.25% v/v Weed-free

  21. Gramoxone Still Works!!!! (for me) Gramoxone Inteon (12 oz/A) + Storm (1.5 pt/A) + 80/20 (0.25% v/v) Untreated PE-26-06 23 DAT

  22. Speed, Nozzle Tip, GPA Effects7 MPH Tractor Speed LSD 0.10 = 3

  23. Gramoxone Inteon (GI) and Basagran (B) Effects on Peanut Yield - 2006 GA-02C Averaged over 4 timings (7, 14, 22, 28 DAC) Included 80/20 @ 0.25% v/v Weed-free P = 0.63

  24. Cadre or Gramoxone fb Cadre??? • 4 field trials conducted in 2005-2006 • 477 lb/A average yield increase when Gramoxone + Basagran was used prior to Cadre compared to Cadre alone • It only takes a 64 lbs/A increase of peanuts to pay for this treatment

  25. Peanut (GA-02C) Response to Roundup Weathermax – 112 DAP

  26. Roundup Weathermax @ 12 ozs/A Applied 71 DAP 8 DAT

  27. Peanut Yield Loss Caused by Roundup WeatherMax GA-O2C Ponder Farm - 2006

  28. www.gaweed.com

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