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Managing Glyphosate-Resistant Palmer Amaranth in Georgia Cotton During 2005

AUTHOR
Stanley Culpepper
Extension Weed Specialist
University of Georgia
Tifton, GA

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TABLE OF CONTENTS
  1. Managing Glyphosate-Resistant Palmer Amaranth in Georgia Cotton During 2005
  2. WeatherMax 22 oz, 2 d after application to 16 inch Palmer
  3. Palmer 3 to 5 inches when treated.
  4. Non-treated
  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. Objective
  11. Materials and Methods
  12. Total POST Treatments
  13. Application Timings
  14. WeatherMax 22 oz vs. Weather Max 22 oz + Staple 0.6 oz POST
  15. Glyphosate-resistant Palmer Amaranth Control With Total POST Systems.
  16. POST System: WMax
  17. POST System: WMax, Staple, Valor
  18. POST System: WMax, Dual, Staple, Valor
  19. Palmer Amaranth Response to Staple plus a NIS
  20. Palmer Amaranth Response to Staple plus a NIS
  21. Palmer Amaranth Response to Staple plus a NIS
  22. Fifteen F2 Glyphosate-Resistant Palmer Amaranth Variably Respond to Staple
  23. Seed Yield Response to Total POST Systems.
  24. System Treatments
  25. Glyphosate-resistant Palmer Amaranth Control With System Treatments.
  26. Glyphosate-resistant Palmer Amaranth Control With System Treatments.
  27. System Treatments: Prowl, Cotoran, WMax, Direx
  28. System Treatments: Prowl, Cotoran, Wmax, Dual, Direx
  29. System Treatments: Prowl, Staple, Wmax, Direx
  30. System Treatments: Prowl, Staple, Wmax, Dual, Direx
  31. System Treatments: Prowl, Reflex, Wmax, Direx
  32. Seed Yield Response to System Treatments.
  33. Conclusions
  34. Conclusions



SLIDE CONTENTS
  1. Managing Glyphosate-Resistant Palmer Amaranth in Georgia Cotton During 2005.
  2. WeatherMax 22 oz, 2 d after application to 16 inch Palmer
  3. 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
  4. Non-treated
  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. Objective Develop effective and economical management systems
  11. Materials and Methods * Two locations ST 5599 BRR Planted May 9 and 10 RCBD Four rows by 35 feet Four replications LSD (P = 0.05) *
  12. Total POST Treatments* RU RU RU RU + Staple RU + Staple RU + Valor RU + Dual RU + Staple RU + Valor 0.5” Palmer 3” Palmer 10” Max Palmer *Dual = Dual Magnum 16 oz/A; RU = Roundup WeatherMax 22 oz/A; Staple = 0.6 oz/A; Valor = 1 oz/A.
  13. Application Timings EPOST: 0.5” Palmer MPOST: 3” Palmer LPD: 10” Palmer 0.5” at application 3” at application
  14. WeatherMax 22 oz + Staple 0.6 oz POST WeatherMax 22 oz
  15. Glyphosate-resistant Palmer Amaranth Control With Total POST Systems. Avg 2 Loc. 2005. 96 a 76 b Percent 3 c RU + Staple + Dual RU + Staple + Staple RU + Valor + Valor
  16. WMax 22 oz EPOST, 0.5” WMax 22 oz MPOST, 3” WMax 22 oz LPD, 10”
  17. WMax 22 oz + Staple 0.6 oz 0.5” WMax 22 oz + Staple 0.6 oz 3” WMax 22 oz + Valor 1 oz 10”
  18. WMax 22 oz + Dual 16 oz 0.5” WMax 22 oz + Staple 0.6 oz 3” WMax 22 oz + Valor 1 oz 10”
  19. Palmer Amaranth Response to Staple plus a NIS. F2 Glyphosate Resistant none Staple 0.6 oz none Staple 0.6 oz Sensitive
  20. Palmer Amaranth Response to Staple plus a NIS. F2 Glyphosate Resistant none Staple 1.2 oz none Staple 1.2 oz Sensitive
  21. Palmer Amaranth Response to Staple plus a NIS. F2 Glyphosate Resistant none Staple 3.0 oz none Staple 3.0 oz Sensitive
  22. Fifteen F2 Glyphosate-Resistant Palmer Amaranth Variably Respond to Staple at 1.8 oz/A plus a NIS.
  23. Seed Yield Response to Total POST Systems. Avg 2 Loc. 2005.
  24. System Treatments* Prowl + Staple RU** RU + Direx Prowl + Cotoran RU** RU + Direx Prowl + Reflex RU** RU + Direx PRE 3” Palmer 10” Max Palmer *Cotoran 1 qt/A; Direx 1.5 pt/A; Prowl 1 qt/A; Reflex 1 pt/A; Staple 0.8 oz/A; Roundup WeatherMax 22 oz. **Either applied alone or mixed with Dual Magnum at 16 oz/A. Rainfall occurred within 48 hours of each application.
  25. Glyphosate-resistant Palmer Amaranth Control With System Treatments. Avg. 2 Loc. 2005.
  26. Glyphosate-resistant Palmer Amaranth Control With System Treatments. Avg. 2 Loc. 2005.
  27. Prowl 1 qt + Cotoran 1 qt PRE WMax 22 oz 3” WMax 22 oz + Direx 1 pt 10”
  28. Prowl 1 qt + Cotoran 1 qt PRE WMax 22 oz + Dual 1 pt 3” WMax 22 oz + Direx 1 pt 10”
  29. Prowl 1 qt + Staple 0.8 oz PRE WMax 22 oz 3” WMax 22 oz + Direx 1 pt 10”
  30. Prowl 1 qt + Staple 0.8 oz PRE WMax 22 oz + Dual 1 pt 3” WMax 22 oz + Direx 1 pt 10”
  31. Prowl 1 qt + Reflex 1 pt PRE WMax 22 oz 3” WMax 22 oz + Direx 1 pt 10”
  32. Seed Yield Response to System Treatments. Avg. 2 Loc. 2005.
  33. Conclusions RU will NOT control this Palmer biotype. Three inch Palmer was not effectively controlled by RU + Staple (0.6 oz/A). Several 0.5 in Palmer also escaped. Staple or Reflex PRE when mixed with Prowl provided excellent early season control.
  34. Conclusions 4. If a biotype obtains resistance to Staple and Roundup, no topical herbicide options in RR or conventional cotton. 5. Residual herbicides will be recommended 3 times during the season. 6. If residual herbicides do not contact the soil or if rainfall is not timely, production may be devastated.