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Glyphosate-Resistant Palmer amaranth response to weed management programs in Roundup Ready and Liberty Link cotton

AUTHOR
Culpepper, York, Kichler, MacRae

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TABLE OF CONTENTS
  1. Glyphosate-Resistant Palmer amaranth response to weed management programs in Roundup Ready and Liberty Link cotton
  2. Glyphosate-Resistant Palmer Amaranth Confirmed
  3. Georgia counties sampled for glyphosate-resistant Palmer amaranth
  4. WeatherMax 88 oz
  5. Objective
  6. 2007 Experiment Location: 2 Studies in Macon County
  7. Greater than 98% of population is resistant
  8. Experiment 1: LL vs RR Systems
  9. RR Herbicide Systems
  10. LL Herbicide Systems
  11. Cultivated 10 days after POT 1 and POT 2 Applications
  12. Weed and Cotton Size
  13. Percent glyphosate-resistant Palmer amaranth control at harvest
  14. WeatherMax + Staple LX + NIS
  15. WeatherMax + Staple LX + NIS
  16. WeatherMax + Staple LX + NIS
  17. WeatherMax + Staple LX + NIS
  18. Percent glyphosate-resistant Palmer amaranth control at harvest
  19. Percent glyphosate-resistant Palmer amaranth control at harvest
  20. Prowl + Reflex PRE and Glyphosate POST
  21. Prowl + Reflex PRE and Ignite POST
  22. WMAX system vs Ignite System
  23. Percent glyphosate-resistant Palmer amaranth control at harvest
  24. Seed cotton yield in RR and LL weed management programs
  25. Seed cotton yield in RR and LL weed management programs
  26. Exp 2: Evaluating large scale Ignite-based programs
  27. Glyphosate-resistant Palmer Amaranth Infesting RR Cotton
  28. Percent glyphosate-resistant Palmer amaranth control at mid-season
  29. Percent glyphosate-resistant Palmer amaranth control at mid-season
  30. Glyphosate-resistant Palmer Amaranth: 2007 - Ignite based program in dryland production
  31. Conclusions
  32. Conclusions
  33. Comments?



SLIDE CONTENTS
  1. Glyphosate-Resistant Palmer amaranth response to weed management programs in Roundup Ready and Liberty Link cotton Culpepper, York, Kichler, MacRae
  2. Glyphosate-resistant Palmer Amaranth Confirmed 05 06 06 07 07
  3. Georgia counties sampled for glyphosate-resistant Palmer amaranth. 2005 2006 2007 (more sites being tested) Confirmed in 83 of 149 fields sampled
  4. WeatherMax 88 oz at 1 inch WeatherMax 88 oz at 4 inch WeatherMax 88 oz at 12 inch
  5. Objective Determine if Ignite-based programs were more effective than Roundup-based programs in managing glyphosate-resistant Palmer amaranth in DRYLAND cotton production
  6. 2007 Experiment Location: 2 Studies in Macon County
  7. WeatherMax 66 oz/A WeatherMax 264 oz/A Greater than 98% of population is resistant Palmer less than 2” when treated
  8. Experiment 1: LL vs RR Systems Split Plot/Factorial Design 2 technologies 6 herbicide systems 2 tillage practices Plot size: 2 rows by 30 feet
  9. RR Herbicide Systems* *Direx + MSMA applied at layby for each herbicide program. Non-treated control included. Prowl = 2 pt/A; Reflex = 1 pt/A; WMax = 22 oz/A; Dual Magnum = 1 pt/A; Staple LX = 1.7 fl oz/A DP 555 BRR
  10. LL Herbicide Systems* *Direx + MSMA applied at layby for each herbicide program. Non-treated control included. Prowl = 2 pt/A; Reflex = 1 pt/A; Ignite = 23 oz/A; Dual Magnum = 1 pt/A; Staple LX = 1.7 fl oz/A FM 1735 LLB2
  11. Cultivated 10 d after POT 1 and POT 2 Applications
  12. PRE: no rain for 17 days POST 1: 1 lf cotton, 2-4 inch Palmer no rain for 21 d POST 2: 6 lf cotton, 2 inch Palmer (new flush) Weed and Cotton Size
  13. Direx + MSMA directed over entire trial area. Percent glyphosate-resistant Palmer amaranth control at harvest. Macon Co., GA. 2007.* + Dual Wmax + Staple Wmax 78 a Prowl PRE 0 c 0 c 30b 70 a 74 a Wmax Wmax Ignite Ignite + Dual Ignite + Staple Ignite POT1 POT2
  14. WeatherMax 22 oz + Staple LX 2.5 oz/A + NIS 35 DAT, 2” when treated
  15. WeatherMax 44 oz + Staple LX 5.0 oz/A + NIS 35 DAT, 2” when treated
  16. WeatherMax 88 oz + Staple LX 10.0 oz/A + NIS 35 DAT, 2” when treated
  17. WeatherMax 176 oz + Staple LX 15.0 oz/A + NIS 35 DAT, 2” when treated
  18. Direx + MSMA directed over entire trial area. * denotes improved control by adding Reflex. Percent glyphosate-resistant Palmer amaranth control at harvest. Macon Co., GA. 2007.* + Dual Wmax + Staple Wmax 78 a Prowl + Reflex 0 c 0 c 30b 70 a 74 a Wmax Wmax Ignite Ignite + Dual Ignite + Staple Ignite * * * * POT1 POT2
  19. Direx + MSMA directed over entire trial area. * denotes improved control by adding Reflex. Percent glyphosate-resistant Palmer amaranth control at harvest. Macon Co., GA. 2007.* + Dual Wmax + Staple Wmax 78 a Prowl + Cultivation 0 c 0 c 30b 70 a 74 a Wmax Wmax Ignite Ignite + Dual Ignite + Staple Ignite * * * * POT1 POT2
  20. Prowl + Reflex PRE and Glyphosate POST. Rainfall 17 d after PRE No Cultivation Cultivation
  21. Prowl + Reflex PRE and Ignite POST. Rainfall 17 d after PRE No Cultivation Cultivation
  22. WMAX system Ignite System Prowl + Reflex PRE; WMax or Ignite + Staple POST 1; WMAX or Ignite POST 2; Direx + MSMA Layby
  23. Direx + MSMA directed over entire trial area. * denotes improved control by adding Reflex. Percent glyphosate-resistant Palmer amaranth control at harvest. Macon Co., GA. 2007.* + Dual Wmax + Staple Wmax 78 a Prowl + Reflex + Cultivation 0 c 0 c 30b 70 a 74 a Wmax Wmax Ignite Ignite + Dual Ignite + Staple Ignite * * * * *
  24. Direx + MSMA directed over entire trial area. Seed cotton yield in RR and LL weed management programs. Macon Co., GA. 2007.* + Dual Wmax + Staple Wmax 1113 a Prowl 0 b 0 b 0 b 1012 a 1133a Wmax Wmax Ignite Ignite + Dual Ignite + Staple Ignite
  25. Direx + MSMA directed over entire trial area. * denotes improved control by adding Reflex. + Dual Wmax + Staple Wmax Prowl + Cultivation Wmax Wmax Ignite Ignite + Dual Ignite + Staple Ignite 1113 a 1012 a 1133a + 831 + 556 + 484 + 400 Seed cotton yield in RR and LL weed management programs. Macon Co., GA. 2007.*
  26. Exp 2: Evaluating large scale Ignite-based programs Treatments Plot size: 12 rows by 1200 feet; 4 reps PRE None Reflex Direx + Reflex POT1 Ignite Layby Pro + MSMA directed over entire trial area. POT2 Ignite
  27. Glyphosate-resistant Palmer Amaranth Infesting RR Cotton 2006 – Glyphosate based program in dryland production
  28. 56 b 97 a 98 a None Direx + Reflex Reflex Percent glyphosate-resistant Palmer amaranth control at mid-season. Macon Co., GA. 2007.* Ignite POT 1
  29. 88 b 99 a 99 a None Direx + Reflex Reflex Percent glyphosate-resistant Palmer amaranth control at mid-season. Macon Co., GA. 2007.* Ignite POT 1 and POT 2 Layby Pro + MSMA directed
  30. Glyphosate-resistant Palmer Amaranth 2007 – Ignite based program in dryland production Non-treated Direx + Reflex PRE Ignite 2” POST 1 Ignite 2” POST 2 LaybyPro + MSMA layby
  31. Conclusions Morningglory controlled > 98% by all programs in both experiments. Greater control of glyphosate-resistant Palmer amaranth was noted with Ignite-based programs. Limitations to LL system adoption: Cultivar Selection Spraying Palmer 2 inch or less
  32. Conclusions 3. Cultivation important for RR & LL programs. 4. LL programs with cultivation provided greatest control, and greatest yields. DP 555 BR - tillage, new herbicide chemistry, or the ability to manage water …... With 555 BR being removed from the market place after 2009….cotton tolerant to Ignite looks very promising!
  33. Comments? Efforts supported by GA Cotton Commission, Cotton Incorporated, Cotton Foundation, and Industry