Slide Presentation

TITLE    (click title to view slides)
Developing An Herbicide-Resistant Weed Management Plan

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

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TABLE OF CONTENTS
  1. Developing An Herbicide-Resistant Weed Management Plan
  2. Evolution of Herbicide Resistant Weeds
  3. Herbicide-resistance is not a new phenomenon! Its been happening since 1968!
  4. Hindrances to Resistance Management
  5. Herbicide Resistant Weed Management Plan
  6. Crop Rotation
  7. Tillage and/or Cultivation
  8. Tillage and Pigweed
  9. Extreme Cover Crops
  10. Row Spacing
  11. Irrigation
  12. Modes of Action
  13. A long-term resistance plan?
  14. Tank Mixtures/Pre-Mixtures
  15. Residual Herbicides
  16. Is this weed resistant? Want to risk it?
  17. Non-Selective Applicators
  18. Hand-Weeding
  19. Post-Harvest Pigweed Problems
  20. PPO Herbicides
  21. Is this already happening?
  22. Ignite and LL Crops
  23. Herbicide Resistant Weed Management Plan
  24. Questions?



SLIDE CONTENTS
  1. Developing An Herbicide-Resistant Weed Management Plan Eric P. Prostko, Ph.D. Professor and Extension Weed Specialist Dept. Crop & Soil Sciences
  2. Evolution of Herbicide Resistant Weeds Repeated applications of herbicides with same site of action (i.e. selection pressure) Annual weeds that…… occur in high populations are widely distributed are prolific seed producers have efficient gene (seed or pollen) dissemination
  3. Herbicide-resistance is not a new phenomenon! Its been happening since 1968! Source: International Survey of Herbicide Resistant Weeds (http://www.weedscience.org/In.asp)
  4. Hindrances to Resistance Management Economics Reluctance to Change Denial Belief that chemical companies will develop “new” products
  5. Herbicide Resistant Weed Management Plan Other Control Tactics Know Modes of Action Rotating MOA Tank-mixtures Residuals Escape Rogueing Post-harvest Future Resistance Concerns
  6. Crop Rotation Yield Loss (%) from 1 AMAPA/row meter
  7. Tillage and/or Cultivation
  8. Tillage and Pigweed Bottom Plow Chisel Plow Source: Twiggs Co., April 22, 2010
  9. Extreme Cover Crops 1 2 3 4
  10. Row Spacing
  11. Irrigation Joy Carter GPC
  12. Modes of Action
  13. A long-term resistance plan?
  14. Tank Mixtures/Pre-Mixtures For herbicide mixtures to be the most effective in delaying the evolution of herbicide resistance they must have (ideally) ….. Different sites of action Similar efficacy and persistence Different propensities for selecting for resistance ALS/ACCase – high Auxins/GS - low
  15. Residual Herbicides Key to future survival Should be used on every acre!!! 1 may not be enough! Dual Magnum @ 1 pt/A (16 DAT)
  16. Alan York NCSU
  17. Non-Selective Applicators
  18. Hand-Weeding
  19. Post-Harvest Pigweed Problems 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
  20. PPO Herbicides Resistance has already been reported in other areas!!! Amaranthus quitensis 2005 (Bolivia) Common waterhemp 2001 (Kansas) 2002 (Illinois) 2005 (Missouri) 2009 (Iowa) Common ragweed 2005 (Delaware) 2006 (Ohio) Wild poinsettia 2004 (Brazil)
  21. Is this already happening? In a 4 year rotation, we could use 16 PPO’s!!!!
  22. Ignite and LL Crops Abuse of Ignite LL cotton, corn, soybeans may jeopardize future technologies (DHT, Dicamba) Current resistances Italian ryegrass (Oregon) Goosegrass (Malaysia)
  23. Herbicide Resistant Weed Management Plan Other Control Tactics Know Modes of Action Rotating MOA Tank-mixtures Residuals Escape Rogueing Post-harvest Future Resistance Concerns
  24. Questions? www.gaweed.com