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Wallace, Culpepper, Vencill, York, Grey

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TABLE OF CONTENTS
  1. Glyphosate-Resistant Palmer Amaranth Response To Dicamba
  2. Cotton In Georgia (2006)
  3. GA ranked second among cotton producing states in 2007
  4. Glyphosate-Resistant Cotton
  5. Percent of cotton acreage planted to RR varieties 2006
  6. Advantages of Glyphosate-Resistant Cotton
  7. Control of Susceptible Palmer Amaranth by Glyphosate
  8. Glyphosate-Resistant Palmer Amaranth
  9. Glyphosate-Resistant Palmer Amaranth in Cotton
  10. Georgia counties infested with glyphosate-resistant Palmer amaranth
  11. Glyphosate-Resistant Palmer Amaranth
  12. Objective
  13. Two Studies to Evaluate Palmer Amaranth Control by Clarity in 2007
  14. Field Trial Macon Co. GA
  15. Glyphosate-resistant Palmer amaranth control by Clarity. Macon Co., GA 2007.
  16. Glyphosate-resistant Palmer amaranth control by Clarity. Macon Co., GA 2007.
  17. Glyphosate-resistant Palmer amaranth control by Clarity. Macon Co., GA 2007.
  18. Glyphosate-resistant Palmer amaranth control by Clarity. Macon Co., GA 2007.
  19. Glyphosate-resistant Palmer amaranth control by Clarity. Macon Co., GA 2007.
  20. Glyphosate-resistant Palmer amaranth control by Clarity. Macon Co., GA 2007.
  21. Clarity 8 oz/A
  22. Clarity 16 oz/A
  23. Field Trial Mt. Olive, NC
  24. Glyphosate-resistant Palmer amaranth control by Clarity. Mt. Olive, NC 2007.
  25. Conclusions - Macon Co.
  26. Conclusions - Mt. Olive
  27. Future Studies
  28. Acknowledgements



SLIDE CONTENTS
  1. Glyphosate-Resistant Palmer Amaranth Response To Dicamba R. D. Wallace, A. S. Culpepper, W. K. Vencill, A. C. York, and T. L. Grey University of Georgia and NC State Department of Crop and Soil Sciences January 2008
  2. Cotton In Georgia (2006) Most widely grown row crop 1.4 million acres produced 2.3 million bales of cotton National Agricultural Statistics Service, USDA
  3. 180 4,925 60 515 85 1,030 47 500 335 380 660 175 51 860 173 400 455 GA ranked second among cotton producing states in 2007 (thousands of acres) National Agricultural Statistics Service, USDA
  4. Glyphosate-Resistant Cotton Glyphosate-resistant cotton was commercialized in 1997 Rapidly adopted by growers
  5. 100 66 97 99 98 98 98 99 99 100 98 98 83 97 75 97 59 Percent of cotton acreage planted to RR varieties 2006 USDA, AMS. 2006. Publ. mp-cn833.
  6. Advantages of Glyphosate-Resistant Cotton Ease of system Properties of glyphosate Agronomic value of the cotton DP 555 BGR in GA
  7. Control of Susceptible Palmer Amaranth by Glyphosate Prior to 2005, glyphosate was an effective and economical tool 22 oz/A WeatherMax on 16 Palmer Amaranth
  8. Glyphosate-Resistant Palmer Amaranth Resistance to glyphosate in Palmer Amaranth was confirmed in 2005 in GA Factors influencing glyphosate-resistance in GA Dependence on a single management tactic Monocultural production system Low use rates Application in stressed situations
  9. Glyphosate-Resistant Palmer Amaranth in Cotton 33 oz WeatherMax applied to 2 Palmer Amaranth
  10. Georgia counties infested with glyphosate-resistant Palmer amaranth. 2005 2006 2007 (more sites being tested) Confirmed in 83 of 149 fields sampled
  11. Glyphosate-Resistant Palmer Amaranth Current management tactics are not very successful New technology is needed Dicamba-tolerant cotton (2014)
  12. Objective Determine glyphosate-resistant Palmer amaranth response to dicamba programs.
  13. Two Studies to Evaluate Palmer Amaranth Control by Clarity in 2007 Mount Olive Macon Co. * *
  14. Field Trial Macon Co. GA 4 Clarity rates: 4, 8, 12, or 16 oz/A 3 Palmer amaranth heights: 3, 6, or 12 12 oz/A sequential application 21-30 days after initial Clarity application Visually evaluated for % control
  15. Glyphosate-resistant Palmer amaranth control by Clarity. Macon Co., GA 2007. Evaluations 26 d after initial application 45c 86b 97 a 99 a % Control
  16. Glyphosate-resistant Palmer amaranth control by Clarity. Macon Co., GA 2007. Evaluations 23 d after sequential application 99a 86b 92ab 96a % Control
  17. Glyphosate-resistant Palmer amaranth control by Clarity. Macon Co., GA 2007. 91 a Evaluations 24 d after initial application 65 b 60b 35c % Control
  18. Glyphosate-resistant Palmer amaranth control by Clarity. Macon Co., GA 2007. 98a 91 a 70 b 38c Evaluations 23 d after sequential application % Control
  19. Glyphosate-resistant Palmer amaranth control by Clarity. Macon Co., GA 2007. 78a 46 b 46 b 43 b Evaluations 19 d after initial application % Control
  20. Glyphosate-resistant Palmer amaranth control by Clarity. Macon Co., GA 2007. 80a 55 b 58 b 43 c Evaluations 23 d after sequential application % Control
  21. Clarity 8 oz/A 3 inch 6 inch
  22. Clarity 16 oz/A 3 inch 6 inch
  23. Field Trial Mt. Olive, NC 1 Palmer amaranth height: 6-7 5 Treatments of Clarity: 8 oz/A 8 oz/A fb 8 oz/A 16 oz/A 16 oz/A fb 8 oz/A 16 oz/A fb 16 oz/A Visually evaluated for % control
  24. Glyphosate-resistant Palmer amaranth control by Clarity. Mt. Olive, NC 2007. Evaluations 42 d after sequential application % Control
  25. Conclusions Macon Co. Palmer amaranth control was affected by plant size, Clarity rate, and the use of sequential applications >90% control was achieved when: 3 Palmer amaranth 12 oz/A, 16 oz/A, 8 oz/A fb 12 oz/A 6 Palmer amaranth 16 oz/A, 12 oz/A fb 12 oz/A, 16 oz/A fb 12 oz/A
  26. Conclusions Mt. Olive Palmer amaranth control was affected by Clarity rate and the use of sequential applications >90% control was achieved when 6-7 Palmer amaranth was treated with 16 oz/A fb 8 oz/A and 16 oz/A fb 16 oz/A
  27. Future Studies Evaluate control of glyphosate-resistant Palmer amaranth through herbicide mixtures Evaluate control of other problematic row-crop weeds through herbicide mixtures
  28. Acknowledgements Committee Members Dr. Alan York University of Georgia Weed Science Unit