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Managing ALS-Resistant Palmer Amaranth in Peanuts

AUTHOR
Eric P. Prostko
Extension Weed Specialist
University of Georgia
Tifton, GA

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TABLE OF CONTENTS
  1. Managing ALS-Resistant Palmer Amaranth in Peanuts
  2. What does ALS mean?
  3. Commonly Used ALS Herbicides
  4. ALS-Resistant Palmer Amaranth Survey
  5. Managing ALS-Resistant Palmer Amaranth in Peanuts
  6. Preemergence Herbicides
  7. Metolachlor Mysteries
  8. GR-Pigweed/Soybean Test - II (2006) 7 WAP
  9. Valor in Peanuts - The Bottom Line
  10. Valor Injury in Peanut
  11. Postemergence Herbicides
  12. How/Why do we let pigweeds get this big?
  13. Will these herbicides control large pigweeds?
  14. Cobra 2EC @ 12.5 ozs/A + COC @ 1% v/v applied to 17' tall pigweed
  15. 2,4-DB/Cobra Test - 2006
  16. Does Cobra reduce yields??
  17. Peanut (GA Green) Response to Cobra 78 DAP - 2006
  18. PPO Resistance???
  19. Where do Cadre and Strongarm fit in?
  20. Cadre @ 4 ozs/A + 2,4-DB @ 1.1 pt/A + COC @ 1% v/v - 34 DAT
  21. Cultivation (no weeds are steel-resistant!!!)
  22. Rope-wick Applicators
  23. Mowing
  24. What if we do not control Palmer amaranth?
  25. ww.gaweed.com



SLIDE CONTENTS
  1. Managing ALS-Resistant Palmer Amaranth in Peanuts Eric P. Prostko Extension Weed Specialist Department of Crop & Soil Sciences The University of Georgia
  2. What does ALS mean? Acetolactate synthase (ALS) Acetohydroxyacid synthase (AHAS) chloroplast enzyme needed to form certain amino acids Valine, leucine, isoleucine Herbicide families Imidazolinones Sulfonylureas Sulfonanalides benzoates
  3. Commonly Used ALS Herbicides Accent Ally/Cimarron Beacon Beyond Cadre Classic Envoke Exceed Express Finesse FirstRate Glean Harmony Extra Maverick Pro Osprey Peak Permit Pursuit Python Scepter Staple Strongarm
  4. ALS-Resistant Palmer Amaranth Survey
  5. Managing ALS-Resistant Palmer Amaranth in Peanuts Weed-free at planting Preemergence herbicides Prowl or Sonalan on every acre + ? Postemergence herbicides Cultivation Harvest Aids Rope-wick applications Mowing Other tactics Crop rotation with corn (atrazine)
  6. Preemergence Herbicides Valor Dual Magnum Generic Metolachlors Outlook/Propel What about….. Reflex Goal Solicam activation
  7. Metolachlor Mysteries
  8. GR-Pigweed/Soybean Test – II (2006) 7 WAP Untreated Valor @ 2 oz/A (PRE) RUWM (POST) RUWM (POST)
  9. Valor in Peanuts - The Bottom Line Plant at least 1.5” deep and apply within 2 days of planting Injury will occur if heavy rainfall occurs from cracking until ~2 WAC peanut yield should not be reduced if stand is not lost hose and nozzle clean-out very important!!!!! except this or do not use it Glyphosate was developed as an industrial cleaner!!
  10. Valor Injury in Peanut
  11. Postemergence Herbicides Timing, timing, timing 16” in 1 week Paraquat G-Inteon Firestorm 15 GPA flat fan nozzles tractor speed Cobra Ultra Blazer Storm 2,4-DB Cobra, Storm, Ultra Blazer, Valor have the same mode of action (PPO inhibitors)
  12. How/Why do we let pigweeds get this big????
  13. Will these herbicides control large pigweeds?
  14. Cobra 2EC @ 12.5 ozs/A + COC @ 1% v/v applied to 17” tall pigweed 1 DAT 4 DAT 7 DAT 16 DAT
  15. 2,4-DB/Cobra Test – 2006 POST: June 5 (17” tall pigweed) POST2: June 9 Photos taken 24 days after POST application Untreated Cobra 2EC @ 12.5 oz/A Agrioil @ 1% v/v POST 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
  16. Does Cobra reduce yields??
  17. Peanut (GA Green) Response to Cobra 78 DAP - 2006 Untreated Cobra @ 12.5 ozs/A Agrioil @ 1% v/v Applied 30 DAP 3556 lbs/A – Tifton 4450 lbs/A - Plains 4003 lbs/A – Tifton 4319 lbs/A - Plains
  18. PPO Resistance??? PPO or Protox Protoporphyrinogen oxidase Enzyme found in chloroplast and mitochondria 3 species worldwide Common waterhemp Kansas (2001) Illinois (2002) Common ragweed Delaware (2005) Wild poinsettia Brazil (2004)\ Ultra Blazer, Cobra, Goal, Reflex, Ronstar, Resource, Aim, Valor, Storm, Spartan
  19. Where do Cadre and Strongarm fit in? Effective on many other weeds Cadre is the only herbicide that will control purple nutsedge
  20. Cadre @ 4 ozs/A + 2,4-DB @ 1.1 pt/A + COC @ 1% v/v – 34 DAT Applied to 17” tall pigweed
  21. Cultivation (no weeds are steel-resistant!!!) Time Diesel fuel prices Strip-tillage Twin rows White mold
  22. Rope-wick Applicators glyphosate is labeled for wiper applications in row middles 33-50% solution Opposite directions 5 MPH or less GR-pigweed concerns??
  23. Mowing Weed/peanut height differential Digging and harvest aid Flail mower better than rotary mower diesel fuel prices Time???
  24. What if we do not control Palmer amaranth?
  25. www.gaweed.com