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A. S. Culpepper, University of Georgia
A. C. York, N. C. State University

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TABLE OF CONTENTS
  1. Controlling Primrose With Low Rates of 2,4-D Alone and in Tank Mixtures
  2. Conservation Tillage Acreage
  3. Cutleaf Eveningprimrose and Wild Radish are the Most Common Weeds For Cotton Burndown
  4. 30 DAT - primrose
  5. Literature Review - Primrose Control
  6. 2,4-D Plant Back Intervals
  7. Objectives
  8. 2003 Locations
  9. Methods
  10. Treatments
  11. Treatments
  12. Primrose Response to 2,4-D. Pooled over Tifton, GA and Rocky Mount, NC. 2003
  13. Primrose Response to 2,4-D. Pooled over Tifton, GA and Rocky Mount, NC. 2003
  14. Primrose Response to 2,4-D. Pooled over Tifton, GA and Rocky Mount, NC. 2003
  15. Large Primrose Response to 2,4-D. Tifton, GA. 2003
  16. Large Primrose Response to 2,4-D. Tifton, GA. 2003
  17. Primrose Response to 2,4-D. 6 WAT. Rocky Mount, NC. 2003
  18. Primrose Response to 2,4-D. 6 WAT. Rocky Mount, NC. 2003
  19. Primrose Response to 2,4-D Mixtures. Pooled over Tifton, GA and Rocky Mount, NC. 2003
  20. Primrose Response to 2,4-D Mixtures. Pooled over Tifton, GA and Rocky Mount, NC. 2003
  21. Primrose Response to WeatherMax. 6 WAT. Rocky Mount, NC. 2003
  22. Primrose Response to 2,4-D. 6 WAT. Rocky Mount, NC. 2003
  23. Primrose Response to 2,4-D Mixtures. 6 WAT. Rocky Mount, NC. 2003
  24. Primrose Response to 2,4-D Mixtures. 6 WAT. Rocky Mount, NC. 2003
  25. Conclusions - 2,4-D Alone
  26. Conclusions - 2,4-D Mixtures
  27. Future Research
  28. Questions?



SLIDE CONTENTS
  1. Controlling Primrose With Low Rates of 2,4-D Alone and in Tank Mixtures A. S. Culpepper and A. C. York University of Georgia N. C. State University
  2. Conservation Tillage Acreage 1998 2003 GA 12% 40% NC 30% 55%
  3. Cutleaf Eveningprimrose and Wild Radish are the Most Common Weeds For Cotton Burndown
  4. 0.75 lb ae NTC 0.5 lb ai glyphosate paraquat 30 DAT- primrose
  5. Literature Review Primrose Control Reynolds, Crawford, Jordan. JCS, 2000. 2,4-D (0.75 lb/A) was the most effective tank mix partner with glyphosate or paraquat Poston, Blaine, Griffin. SWSS, 2003. Control averaged 95% when 2,4-D (0.75 lb/A) was added to glyphosate Culpepper and York. SWSS, 2002. Most effective tank mix partner with glyphosate or paraquat was 2,4-D (0.5 lb/A)
  6. 2,4-D Plant Back Intervals Barrage HF and Salvo 30 day prior to plant Many other 2,4-Ds 3 months or until disappeared
  7. Objectives How much 2,4-D alone is needed to control primrose? How much 2,4-D do we need to add with a non-selective herbicide option to control primrose?
  8. 2003 Locations Rocky Mount * Tifton *
  9. Methods Plot size: 6 by 25 feet, GA 12 by 20 feet, NC Design: RCB Reps: 4 GA, 3 NC MPH: 3 GPA: 15 Tips: flat fan
  10. Treatments 2,4-D amine (4 lb ae/gal) 4 oz/A 8 oz/A 12 oz/A 16 oz/A
  11. Treatments Roundup WeatherMax at 16 oz NC, 21 oz GA WeatherMax + Valor at 1 oz/A Gramoxone at 1 qt/A + Caparol at 1 qt/A Alone or with 4 oz/A of 2,4-D
  12. Primrose Response to 2,4-D. Pooled over Tifton, GA and Rocky Mount, NC. 2003.* *Primrose 6 to 9 inches at time of application. 2,4-D (oz/A)
  13. Primrose Response to 2,4-D. Pooled over Tifton, GA and Rocky Mount, NC. 2003.* *Primrose 6 to 9 inches at time of application. Statistical comparison is within rating date.
  14. Primrose Response to 2,4-D. Pooled over Tifton, GA and Rocky Mount, NC. 2003.* *Primrose 6 to 9 inches at time of application. Statistical comparison is within rating date.
  15. Large Primrose Response to 2,4-D. Tifton, GA. 2003.* *Primrose 16 to 20 inches at time of application.
  16. Large Primrose Response to 2,4-D. Tifton, GA. 2003.* *Primrose 16 to 20 inches at time of application. Statistical comparison is within rating date.
  17. Primrose Response to 2,4-D. 6 WAT. Rocky Mount, NC. 2003. Non-treated Control 8 oz 2,4-D
  18. Primrose Response to 2,4-D. 6 WAT. Rocky Mount, NC. 2003. Non-treated Control 4 oz 2,4-D
  19. Primrose Response to 2,4-D Mixtures. Pooled over Tifton, GA and Rocky Mount, NC. 2003.* *Primrose 6 to 9 inches at time of application. Statistical comparison is with and without 2,4-D. Roundup WeatherMax 16 to 21 oz/A, Valor 1 oz/A, Gramoxone 1 qt/A, and Caparol 1 qt/A.
  20. Primrose Response to 2,4-D Mixtures. Pooled over Tifton, GA and Rocky Mount, NC. 2003.* *Primrose 6 to 9 inches at time of application. Statistical comparison is with and without 2,4-D. Roundup WeatherMax 16 to 21 oz/A, Valor 1 oz/A, Gramoxone 1 qt/A, and Caparol 1 qt/A.
  21. Primrose Response to WeatherMax. 6 WAT. Rocky Mount, NC. 2003. Non-treated Control 16 oz WeatherMax
  22. Primrose Response to 2,4-D. 6 WAT. Rocky Mount, NC. 2003. 16 oz WeatherMax + 4 oz 2,4-D
  23. Primrose Response to 2,4-D Mixtures. 6 WAT. Rocky Mount, NC. 2003. 16 oz WeatherMax + 8 oz 2,4-D
  24. Primrose Response to 2,4-D Mixtures. 6 WAT. Rocky Mount, NC. 2003. WeatherMax + Valor + 4 oz 2,4-D
  25. Conclusions 2,4-D Alone At 30 DAT, only 12 and 16 oz/A of 2,4-D provided greater than 90% primrose control. By 45 DAT, all rates of 2,4-D provided greater than 90% primrose control. By 56 DAT, primrose control was nearly complete regardless of rate. Primrose size did not appear to matter What rate?? How long can you wait!!!
  26. Conclusions 2,4-D Mixtures At 15 DAT: Roundup (32%), Roundup + Valor (87%), Gramoxone + Caparol (90%) At 15 DAT: mixing 4 oz/A 2,4-D with Roundup improved control 25%. At 45 DAT: Roundup (71%), Roundup + Valor (81%), Gramoxone + Caparol (81%). At 45 DAT: mixing 4 oz/A of 2,4-D improved control of non-selective treatments by 18 to 28%.
  27. Future Research Results must be confirmed!! Plant back interval to cotton??
  28. QUESTIONS?