Slide Presentation

TITLE    (click title to view slides)
2020 Cotton County Update

AUTHOR
Stanley Culpepper
Professor and Extension Weed Specialist
University of Georgia

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TABLE OF CONTENTS
  1. Cotton Weed Management - 2020
  2. Annual Dicamba Stewarship Training
  3. Dicamba 2020 Labels
  4. Will there be 2021 labels that are usable in our cotton?
  5. Updating State Labels - Burndown
  6. Updating State Labels - Burndown
  7. Updating State Labels - Burndown
  8. Tavium Registration for GA Cotton
  9. List Your Most Challenging Pests
  10. Cotton Management Program
  11. Killing emerged weeds immediately prior to planting vs immediately after planting.
  12. Cotton Management Program
  13. Number of emerged Palmer amaranth/A at 21 d.
  14. Number of emerged Palmer amaranth/A at POST 1.
  15. Weed Management System Influences Plant Bug Population. Ideal, GA.*
  16. Damaged Terminals vs Weed Management System. Ideal, GA.
  17. Palmer amaranth Adjacent to Cotton Influences Damage from Tarnished Plant Bug.
  18. Number of Laterals vs Temperature
  19. Influence of seed depth and moisture at planting.
  20. Influence of seed depth and moisture at planting. Reflex 16 oz/A
  21. Influence of seed depth and moisture at planting. Warrant 3 pt/A
  22. Influence of seed depth and moisture at planting. Direx 16 oz/A
  23. Cotton Management Program
  24. Interval Between Liberty Applications Influences Palmer Control at Harvest.*
  25. Cotton Management Program
  26. Hot Topics - 2019 - Review
  27. Palmer 5" Response to Herbicides As Influenced by Varying Moisture Stress
  28. Grass Complaints From Roundup + Dicamba Continue
  29. Grass Complaints From Roundup + Dicamba Continue
  30. Warrant PRE
  31. Currently, greatest concern with dicamba technology is volatility!
  32. Irrigation Influences Volatility! Tunnels, 2019.
  33. FAR FROM BULLET PROOF!
  34. PPO Resistance Will Be Devastating
  35. PALMER Amaranth Resistant to PPO Herbicides
  36. Questions?



SLIDE CONTENTS
  1. Cotton Weed Management - 2020 Herbicide updates (Dicamba, Valor, Tavium) Weed management program Plant bugs Grass control Spiderwort control PPO resistance update Glyphosate…is it safe for us to use?
  2. Annual Dicamba Stewarship Training 2020 Using Pesticides Wisely UGA/GDA have submitted label to allow for training every other year? U.S. EPA is considering our proposal. UPW meetings will be in March.
  3. Dicamba 2020 Labels same as 2019 Pesticide license required 2 applications in cotton; complete within 60 d of planting Application 1 hr after sunrise – 2 hr of sunset “Do not apply when wind is blowing in the direction of neighboring downwind sensitive crops.” Be smart, these products are volatile Avoid inversions, winds 3-10 mph
  4. Will there be 2021 labels that are usable in our cotton? FILL OUT SURVEY IF YOU WANT INPUT!
  5. Updating State Labels - Burndown
  6. Updating State Labels - Burndown
  7. Updating State Labels - Burndown Strip-till rig: >30% residue = 7 days 10-30% residue = 14 days; 0.5” rain <10% residue = 21 days; 1” rain No-till: 28 days + 0.5” (>10% cover) or 1” rain (<10% cover)
  8. Tavium Registration for GA Cotton XtendiMax + Dual Magnum Overtop from full emergence through 6 lf cotton or 60 days after planting; whichever most restrictive. Must have license to cover dicamba application. Applicator must have attended UPW.
  9. List Your Most Challenging Pests *Points were determined by giving 3 points for 1st choice of importance, 2 points for 2nd choice, and 1 point for 3rd choice. All locations – 1737 growers participated
  10. Cotton Management Program Pigweed free at planting Two effective residual herbicides PRE Sequential POST applications Layby with directed/hooded applic
  11. Killing emerged weeds immediately prior to planting vs immediately after planting. Roundup applied 4 hours before planting. Roundup applied 1 hour after planting.
  12. Cotton Management Program Pigweed free at planting Two effective residual herbicides PRE Sequential POST applications Layby with directed/hooded applic
  13. Reflex 16 oz Direx 16 oz Warrant 48 oz Reflex 12 oz + Direx 12 oz Reflex 12 oz + Warrant 32 oz Direx 12 oz + Warrant 40 oz 39,650 bc 26,840 c 55,510 ab 4270 c 2440 c 4575 c The non-treated control consisted of 1,464,000 per acre; LSD 21 K; Number of emerged Palmer amaranth/A at 21 d.
  14. Conventional 1,961,175 A 480,869 B 3717 C 1,524 C Reflex 12 oz/A + Warrant 2 pt/A PRE. 4 locations. Number of emerged Palmer amaranth/A at POST 1. Rye Cover Conventional + PRE Rye Cover + PRE If 1 in 1,000,000,000 is resistant you have one on about every 500 acres
  15. Weed Management System Influences Plant Bug Population. Ideal, GA.* Weedy – up to 10X increase in plant bug population Weed-free
  16. Damaged Terminals vs Weed Management System. Ideal, GA. 45 40 35 30 25 20 15 10 5 0 2018 2017 15 B 9 B 45 40 35 30 25 20 15 10 5 0 Weed-free Weedy Damaged Terminals (%) Weed Management System Weed-free Weedy Damaged Terminals (%)
  17. Palmer amaranth 0 144 ft. 0/5 plants 2/5 plants 1/5 plants 3/5 plants 4/5 plants 5/5 plants Palmer amaranth Adjacent to Cotton Influences Damage from Tarnished Plant Bug.
  18. 93 F 104 F
  19. 0.35” deep moist 0.7” deep moist 0.35” deep Very dry 0.7” deep Very dry Influence of seed depth and moisture at planting.
  20. 0.35” deep moist 0.7” deep moist 0.35” deep Very dry 0.7” deep Very dry Influence of seed depth and moisture at planting. Reflex 16 oz/A 27% 36% 7% 7%
  21. 0.35” deep moist 0.7” deep moist 0.35” deep Very dry 0.7” deep Very dry Influence of seed depth and moisture at planting. Warrant 3 pt/A 8% 16% 4% 4%
  22. 0.35” deep moist 0.7” deep moist 0.35” deep Very dry 0.7” deep Very dry Influence of seed depth and moisture at planting. Direx 16 oz/A 3% 6% 0% 0%
  23. Cotton Management Program Pigweed free at planting Two effective residual herbicides PRE Sequential POST applications Layby with directed/hooded applic
  24. Interval Between Liberty Applications Influences Palmer Control at Harvest.* 1 65 c 82 b No POST 2 7 98 a 85 b % 99 a 99 a 98 a 3 5 10 14 Day interval between Liberty applications *Data pooled over 3 locations from TyTy GA and over herbicide option. Palmer 6-8” at time of initial Liberty application. Labeled Labeled Labeled
  25. Cotton Management Program Pigweed free at planting Two effective residual herbicides PRE Sequential POST applications Layby with directed/hooded applic
  26. Hot Topics – 2019 - Review
  27. RU + XtendiMax Liberty 55 81 30 90 DAT = 11. LSD 14. C44-19. Liberty and PowerMax II = 32 oz/A; XtendiMax = 22 oz/A. Palmer 5” Response to Herbicides As Influenced by Varying Moisture Stress Drought Stress Stress removed 8 hr earlier Drought Stress Stress removed 8 hr earlier
  28. Grass Complaints From Roundup + Dicamba Continue Steckel 2012
  29. Grass Complaints From Roundup + Dicamba Continue Steckel 2012 START WITH THE CORRECT PRE!!!!! No less than 32 oz/A PowerMax II or labeled alternative equivalent Less than 4” grass; goosegrass less than 2” Environmental conditions huge impact Sequential grass treatment may be needed
  30. Warrant PRE Dual/Warrant 2,4-D excellent Dicamba – twice Liberty – no good
  31. Currently, greatest concern with dicamba technology is volatility! Anything new?
  32. 0.1” Irrigation % soybean damage from volatility 30 a 7 b 0 c 0.35” Irrigation *RU PMAX + XtendiMax 3X. Need 4 hr of drying time. Irrigation Influences Volatility! Tunnels, 2019.
  33. FAR FROM BULLET PROOF! Volatility can occur before water gets there! Soil type likely influences result. All acres are not irrigated….many are! Walk slowly – don’t get cocky!
  34. PPO Resistance Will Be Devastating
  35. Sensitive Problem site Reflex 96 oz/A + NIS; Palmer 2” PALMER Amaranth Resistant to PPO Herbicides
  36. Questions?