Slide Presentation

TITLE    (click title to view slides)
Strategies for Palmer Amaranth (Pigweed) Management in Peanut

AUTHOR
Eric P. Prostko
Professor and Extension Weed Specialist
University of Georgia

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TABLE OF CONTENTS
  1. Strategies for Palmer Amaranth (Pigweed) Management in Peanut
  2. Important Things to Know About Palmer Amaranth
  3. Palmer Amaranth - Competitive and Prolific!!!!
  4. Palmer Amaranth Control Tactics
  5. Many pigweed problems are due to weeds already up at planting!
  6. Dryland Production Systems A Difficult Challenge!
  7. Extreme Cover Crops
  8. Tillage and Pigweed
  9. Irrigation
  10. Palmer Amaranth Control - 2010
  11. Palmer Amaranth Control - 2010
  12. Gramoxone Inteon + Storm + Dual Magnum + 2,4-DB
  13. Gramoxone Inteon + Storm + Dual Magnum + 2,4-DB
  14. POST Control Options
  15. Timing is Critical for POST’s!!!
  16. ALS-Resistant Palmer Amaranth in GA
  17. Where does Cadre fit now?
  18. Non-Selective Applicators
  19. What are the benefits of NSA’s?
  20. Non-Selective Applicators or (Custer’s Last Stand)
  21. WeedWiper vs. TopCrop Sponge
  22. WeedWiper vs. LMC-Cross Wick
  23. Applicator Costs
  24. Section 24C SLN
  25. Post-Harvest (Corn) Management
  26. Palmer Amaranth Control Tactics
  27. Questions?



SLIDE CONTENTS
  1. Strategies for Palmer Amaranth (Pigweed) Management in Peanut Eric P. Prostko Professor and Extension Weed Specialist Department of Crop & Soil Sciences Farm Bureau - 2010
  2. Important Things to Know About Palmer Amaranth A well-adapted plant! Native to Sonoran desert Separate male and female plants Lots of seed!!!! Seed do not last long in soil 20% germ after 30 months Seed do not emerge from deep depths (= 4”) Seed need light to germinate Resistance trait moves in pollen At least 1000 feet
  3. Palmer Amaranth Competitive and Prolific!!!! 1 Palmer amaranth plant per meter (3.2 ft) of row can reduce peanut yield by 28%. 1 Female Palmer amaranth plant can produce 400,000-500,000 seed Source: Burke et al., 2007. Weed Technology 21:367-371
  4. Palmer Amaranth Control Tactics Start Clean!!!!! Tillage Extreme Cover Crops Residual Herbicides Irrigation May need more than 1 Timely POST’s Others Hand-Weeding Non-Selective Applicators
  5. Many pigweed problems are due to weeds already up at planting!
  6. Dryland Production Systems A Difficult Challenge! Growers need to think about mechanical herbicide incorporation Will help but not a guarantee Success will depend upon…… operator implement soil conditions Prowl/Sonalan + Dual Magnum?
  7. Extreme Cover Crops 1 2 3 4
  8. Tillage and Pigweed Bottom Plow Chisel Plow Source: Twiggs Co., April 22, 2010
  9. Irrigation Joy Carter GPC
  10. Palmer Amaranth Control - 2010 PE-03-10 June 29 NTC Prowl H20 3.8ASC @ 34 oz/A (PRE) Valor SX 51WG @ 3 oz/A (PRE) Cadre 2AS @ 4 oz/A (June 14) COC @ 1% v/v (June 14)
  11. Palmer Amaranth Control - 2010 PE-03-10 June 29 NTC Gramoxone Inteon 2SL @ 12 oz/A (June 2) Storm 4SL @ 16 oz/A (June 2) Dual Magnum 7.62EC @ 16 oz/A (June 2) Cadre 2AS @ 4 oz/A (June 14) Dual Magnum 7.62EC @ 16 oz/A (June 14)
  12. Gramoxone Inteon @ 12 oz/A + Storm @ 16 oz/A + Dual Magnum @ 1 pt/A + 2,4-DB @ 1 pt/A (Left) NTC (Middle) Gramoxone Inteon @ 12 oz/A + Storm @ 16 oz/A + Dual Magnum @ 1 pt/A (Right) May 8, 2010 13 DAT
  13. Gramoxone Inteon @ 12 oz/A + Storm @ 16 oz/A + Dual Magnum @ 1 pt/A + 2,4-DB @ 1 pt/A (Left) NTC (Middle) Gramoxone Inteon @ 12 oz/A + Storm @ 16 oz/A + Dual Magnum @ 1 pt/A (Right) May 26, 2010 July 20, 2010 34 DAT (Cadre) Cadre @ 4 oz/A + Dual Magnum @ 16 oz/A (June 16)
  14. POST Control Options 2,4-DB
  15. Timing is Critical for POST’s!!!
  16. ALS-Resistant Palmer Amaranth in GA 2005 Survey First discovered in 2000 ALS Herbicides – Peanut Cadre Classic Pursuit Strongarm
  17. Where does Cadre fit now? nutsedges Only control for purple sicklepod morningglory
  18. Non-Selective Applicators
  19. What are the benefits of NSA’s? Improved harvest efficiency Improved fungicide deposition Reduction in weed seed Cheaper than hand-weeding? REVENGE!!!!!
  20. Non-Selective Applicators or (Custer’s Last Stand)
  21. WeedWiper vs. TopCrop Sponge 50% Solution of Gramoxone Inteon 3.1 MPH, 20” Applicator Height AMAPA = 36-86” tall, 66” avg. NTC WeedWiper TopCrop PIG-07-10 9/21/10 29 DAT
  22. WeedWiper vs. LMC-Cross Wick 50% Solution of Gramoxone Inteon 3.1 MPH, 15” Applicator Height AMAPA = 16-62” tall, 34” avg. NTC WeedWiper LMC-Cross PIG-06-10 9/24/10 28 DAT
  23. Applicator Costs 20’ Weed Wiper + gauge wheels + 40 gallon tank = $6800 20’ Wickmaster = $5500 6-Row (18’) LMC-Cross Wick Bar = $6225 15’, front mount, pump fed, TopCrop Weed Wiper = $1995
  24. Section 24C SLN Granted July 27, 2010 Peanuts (GA) Palmer amaranth Florida beggarweed
  25. Post-Harvest (Corn) Management Decreasing daylight hastens flower and seed production Flowering (3-4 weeks) Seed production (2-3 weeks) Some germination at 410F (8%) Control Options Mowing Tillage Herbicides Gramoxone + 2,4-D or dicamba Residuals i.e. Dual Magnum? When can we stop worrying about seed production? Keeley et al. 1987. Weed Science 35:199-204 Steckel et al., 2004. Weed Science 52:217-221
  26. Palmer Amaranth Control Tactics Start Clean!!!!! Irrigation Tillage Extreme Cover Crops Residual Herbicides Timely POST’s Others Hand-Weeding Non-Selective Applicators
  27. Questions? www.gaweed.com