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AUTHOR
Stanley Culpepper
University of Georgia
Tifton Campus

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TABLE OF CONTENTS
  1. Glyphosate-Resistant Palmer Amaranth Has the Potential to Devastate Georgia Agriculture
  2. Glyphosate-Resistant Palmer Amaranth
  3. Photo
  4. WeatherMax 22 oz, 2 d after application to 16 inch Palmer
  5. Experiment 1: Palmer 3 to 5 inches when treated
  6. WeatherMax 33 oz/A
  7. WeatherMax 66 oz/A
  8. WeatherMax 132 oz/A
  9. WeatherMax 198 oz/A
  10. WeatherMax 264 oz/A
  11. Experiment 2: Materials and Methods
  12. Non-treated Control
  13. WeatherMax 22 oz
  14. WeatherMax 44 oz
  15. WeatherMax 88 oz
  16. Middle Georgia Cotton Field, July 9, 2006
  17. Why did this happen?
  18. Grower Practices
  19. Grower Practices
  20. Progression of Herbicide Resistance
  21. Georgia Counties
  22. Roundup Based Program without Resistance
  23. Prowl PRE, WMax POST, WMax + Direx Layby
  24. Prowl PRE, WMax + Dual Mag. POST, WMax + Direx Layby
  25. Prowl + Staple PRE, WMax + Dual Mag. POST, WMax + Direx Layby
  26. Prowl + Cotoran PRE, WMax + Dual Mag. POST, WMax + Direx Layby
  27. Prowl + Reflex PRE, WMax + Staple POST, WMax + Direx Layby
  28. Commonly Used ALS Herbicides
  29. WMax 22 oz; Palmer 4" when treated
  30. WMax 22 oz + Staple LX 1.7 oz; Palmer 4" when treated
  31. WMax 22 oz + Staple LX 2.55 oz; Palmer 4" when treated
  32. WMax 22 oz + Staple LX 1.7 oz; Palmer 0.5" when treated
  33. WMax 22 oz + Staple LX 2.55 oz; Palmer 0.5" when treated
  34. RR Cotton System vs Liberty Link Cotton System
  35. Palmer Amaranth
  36. Field Photo
  37. Field Photo
  38. Ian Heaps Web Site
  39. Herbicide Resistance in Georgia
  40. Glyphosate-Resistant Palmer Management
  41. Photo



SLIDE CONTENTS
  1. Glyphosate-Resistant Palmer Amaranth Has the Potential to Devastate Georgia Agriculture A. Stanley Culpepper University of Georgia Tifton Campus
  2. Glyphosate-Resistant Palmer Amaranth 1) Glyphosate-resistant Palmer amaranth confirmed in GA. 2) Why are we having this problem? 3) How widespread? 4) How much of a management nightmare are we facing? 5) Other resistant weeds?
  3. WeatherMax 22 oz, 2 d after application to 16 inch Palmer
  4. Experiment 1: Palmer 3 to 5 inches when treated. Dual Magnum applied over entire trial to eliminate continual emergence. WeatherMax 33 oz 66 oz 132 oz 198 oz 264 oz
  5. WeatherMax 33 oz/A
  6. WeatherMax 66 oz/A
  7. WeatherMax 132 oz/A
  8. WeatherMax 198 oz/A
  9. WeatherMax 264 oz/A
  10. Application Timings EPOST: 0.5 Palmer MPOST: 3 Palmer LPD: 10 Palmer 0.5 at application 3 at application Field Experiment 2: Materials and Methods
  11. Non-treated Control
  12. WMax 22 oz EPOST, 0.5 WMax 22 oz MPOST, 3 WMax 22 oz LPD, 10
  13. WMax 44 oz EPOST, 0.5 WMax 44 oz MPOST, 3 WMax 44 oz LPD, 10
  14. WMax 88 oz EPOST, 0.5 WMax 88 oz MPOST, 3 WMax 88 oz LPD, 10
  15. Middle Georgia Cotton Field, July 9 2006
  16. Why did this happen? % Acres
  17. 94% Roundup Ready 44% strip-till Greater than 88% not cultivated Trends away from effective residual herbicides Grower Practices
  18. Numerous applications of Roundup have replaced conventional chemistry and many tillage practices, year after year after year. Grower Practices
  19. Progression of Herbicide Resistance Alan York, NCSU
  20. Roundup Based Program without resistance
  21. Prowl PRE, WMax POST, WMax + Direx Layby Glyphosate-resistant Palmer response to common programs.
  22. Prowl PRE, WMax + Dual Mag. POST, WMax + Direx Layby Glyphosate-resistant Palmer response to common programs.
  23. Prowl + Staple PRE, WMax + Dual Mag. POST, WMax + Direx Layby Glyphosate-resistant Palmer response to common programs.
  24. Prowl + Cotoran PRE, WMax + Dual Mag. POST, WMax + Direx Layby Glyphosate-resistant Palmer response to common programs.
  25. Prowl + Reflex PRE, WMax + Staple POST, WMax + Direx Layby Glyphosate-resistant Palmer response to common programs.
  26. Commonly Used ALS Herbicides Accent Ally Beacon Cadre Classic Envoke Exceed Express Finesse FirstRate Harmony Extra Osprey Peak Permit/Sandea Pursuit Python Scepter Staple Strongarm All have the same mode of action!!!!!!! Eric Prostko
  27. WMax 22 oz; Palmer 4 when treated
  28. WMax 22 oz + Staple LX 1.7 oz; Palmer 4 when treated
  29. WMax 22 oz + Staple LX 2.55 oz; Palmer 4 when treated
  30. WMax 22 oz + Staple LX 1.7 oz; Palmer 0.5 when treated
  31. WMax 22 oz + Staple LX 2.55 oz; Palmer 0.5 when treated
  32. Prowl PRE, Roundup POST Twice (RR cotton) Prowl PRE, Ignite POST Twice (Liberty Link cotton)
  33. Palmer Amaranth Male and female plants Forced out crossing Typical 400,000 to 600,000 seed per plant Resistance is carried through pollen (>50% offspring resistant in initial work)
  34. Ian Heaps Web Site (www.weedscience.org/in.asp) 182 species resistant to herbicides in the world 8 species resistant to glyphosate buckhorn plantain common ragweed hairy fleabane horseweed goosegrass Italian ryegrass rigid ryegrass Palmer amaranth
  35. Herbicide Resistance in Georgia Eric Prostko
  36. Glyphosate-Resistant Palmer Management Diversity -herbicide selection -cropping system -cultural practices such as tillage Monitor and be aware! Three to five year plan!!!!