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2010 Beltwide – Cotton Response to Milo Pro

AUTHOR
Lynn Sosnoskie, Stanley Culpepper, Jared Whitaker, Jeremy Kichler, Alan York

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TABLE OF CONTENTS
  1. Cotton and Palmer Amaranth (AMAPA) Response to Milo-Pro Applied at-Plant and POST
  2. Palmer Amaranth
  3. AMAPA is large, competitive, C4 annual that can form dense populations in infested fields
  4. Cotton is particularly susceptible to weed interference
  5. 1X Weathermax + 1X Staple LX at 5 WAT
  6. Palmer Amaranth
  7. Palmer Amaranth growth
  8. Residual Herbicide use is needed for the management of AMAPA in cotton
  9. Locations
  10. Macon County and Moultrie, GA
  11. Locations
  12. Rocky Mount, NC
  13. Cotton Injury
  14. Cotton Injury - At Plant Application
  15. Reflex Injury at 1pt/A PRE
  16. Cotton Injury - POST Application to 2-3 Leaf Cotton
  17. Milo-Pro 2 pt/A plus Roundup POST
  18. Rocky Mount, NC
  19. Rocky Mount, NC
  20. GLY-R AMAPA Control
  21. GLY-R AMAPA Control - At Plant Application
  22. GLY-R AMAPA Control - At Plant Application
  23. GLY-R AMAPA Control - POST1 Application
  24. GLY-R AMAPA Control - POST1 Application
  25. GLY-R AMAPA Control - All POST Applications
  26. Reflex PRE fb WMAX fb WMAX fb Direx + MSMA
  27. Reflex PRE fb Milo-Pro (2 pt/A) + WMAX fb WMAX fb Direx + MSMA
  28. Reflex PRE fb Milo-Pro (1 pt/A) + WMAX fb Milo-Pro (1 pt/A) + WMAX fb Direx + MSMA
  29. GLY-R AMAPA Control and Yield
  30. Cotton Injury and Yield
  31. Previous Research
  32. Previous Research
  33. Summary
  34. Summary



SLIDE CONTENTS
  1. Cotton and Palmer Amaranth (AMAPA) Response to Milo-Pro Applied at-Plant and POST Lynn M. Sosnoskie and A. Stanley Culpepper UGA, Tifton, GA Jared Whitaker UGA, Statesboro, GA Jeremy M. Kichler UGA, Oglethorpe, GA Alan C. York NCSU, Raleigh, NC
  3. AMAPA is large, competitive, C4 annual that can form dense populations in infested fields, reducing yields and harvest efficiency
  4. Cotton is particularly susceptible to weed interference Planted at lower densities than other crops Requires higher temperatures for rapid growth Uncompetitive crop canopy
  5. 1X Weathermax + 1X Staple LX at 5 WAT
  7. 1/2 inch in 12 hr 4 inches 52 hr
  8. Residual Herbicide use is needed for the management of AMAPA in cotton Milo-Pro TM Propazine PSII electron transport inhibitor PRE and POST for grain sorghum 0.75 to 1.2 qts/A for sandy loam to clay loam soils Not recommended for sands or loamy sands Cotton does have some tolerance to propazine Abernathy et al. 1969. Agron. J. Kendig et al. 2006. PHP
  9. Locations Macon County, GA and Moultrie, GA Sutton’s Field and Southern Ag Expo Sandy loam Planted 28 May, 2009 (Macon) Planted 14 May, 2009 (Moultrie) 6’ x 25’ plots, 36” row spacing DP 0949 B2RF Herbicide treatments replicated 3X in RCBD Herbicides applied at application volume of 14.8 Gal/A with CO2 backpack sprayer and flat fan nozzles Crop injury GLY-R AMAPA control at Macon County site
  10. Macon County and Moultrie, GA
  11. Locations Rocky Mount, NC (2 sites) Upper Coastal Plain Research Station Sandy loam Planted 6 and 13 May, 2009 12’ x 30’ plots, 36” row spacing DP 0924 B2RF Herbicide treatments replicated 4X in RCBD Herbicides applied at application volume of 14.8 Gal/A with CO2 backpack sprayer and flat fan nozzles Crop injury
  12. Rocky Mount, NC
  13. Cotton Injury
  14. Cotton Injury - At Plant Application Data averaged across Macon County and Moultrie, GA, sites
  15. Reflex Injury at 1pt/A PRE
  16. Cotton Injury – POST Application to 2-3 Leaf Cotton Data averaged across Macon County and Moultrie, GA, sites
  17. Milo-Pro 2 pt/A plus Roundup POST 1 WA-POST1 Application to 2-3 leaf cotton
  18. Rocky Mount, NC Some Milo-Pro PRE injury, especially at higher rate, but no more than 10% in any one plot; mean injury was not >6% and was transient
  19. Rocky Mount, NC Some Milo-Pro POST injury, especially at higher rate, but no more than 10% in any one plot; mean injury was not >8% and was transient
  20. GLY-R AMAPA Control
  21. GLY-R AMAPA Control - At Plant Application Macon County, GA
  23. GLY-R AMAPA Control – POST1 Application Macon County, GA All treatments received Weathermax at 22 oz/A at POST1
  25. GLY-R AMAPA Control – All POST Applications Macon County, GA All treatments received Weathermax at 22 oz/A at POST1 and POST2 All treatments received Direx and MSMA at Layby (POST3)
  26. Reflex PRE fb WMAX fb WMAX fb Direx + MSMA
  27. Reflex PRE fb Milo-Pro (2 pt/A) + WMAX fb WMAX fb Direx + MSMA
  28. Reflex PRE fb Milo-Pro (1 pt/A) + WMAX fb Milo-Pro (1 pt/A) + WMAX fb Direx + MSMA
  29. GLY-R AMAPA Control and Yield Macon County, GA All treatments received Weathermax at 22 oz/A POST1 and POST2 All treatments received Direx and MSMA at Layby (POST3)
  30. Cotton Injury and Yield Clayton, NC Injury ratings of 5 to 7% were observed 1-3 WA-PRE applications of Milo-Pro at 1 pt/A at Attapulgus, GA. No injury was observed 6 WA-PRE. This isn’t different than what was seen at Rocky Mount. Injury ratings of 13 to 32% were observed 1-3 WA-PRE applications of Milo-Pro at 2 pt/A at Attapulgus, GA. Injury was still 33% 3 WA-POST2.
  31. Previous Research Abernathy et al. 1969. Agron. J. 48 cotton varieties evaluated for resistance to propazine broadcast PRE at 0.56 kg/ha Sandy loam with OM <1% Injury ratings ranged from 3-53% Aubun M, Acala B-3080, Paymaster 303 = 3% Coker 5110, Coker 312 = 8% Paymaster 111A, Deltapine SR-2 = 50% Blightmaster A-5 = 53% Less than 20% was regarded as a tolerant response to propazine
  32. Previous Research Kendig et al. 2006. Plant Health Progress DP 5415RR was screened for tolerant to propazine 5 rates: 0, 0.25X, 0.5X, 1X, 2X of 1.12 kg/ha 4 growth stages: PRE, cotyledon, 2-lf, 4-lf Some injury observed for PRE applications (sandy-loam) but visual injury and weight reductions were greatest from over the top applications made at the cotyledon and 2-lf stages Injury increased with rate
  33. Summary Milo-Pro applied PRE at 1-2 pts/A injured cotton 0-7% (Attapulgus, Rocky Mount); injury was transient There was no observable injury at Macon County and Moultrie for Milo-Pro applied PRE Higher rates (4 lbs/A), on sandier soils (Attapulgus, Clayton) with adequate rainfall resulted in unacceptable injury ratings due to PRE applications Injury resulting from POST applications of Milo-Pro did not exceed 8%; injury was not greater than what was observed for Staple; injury was transient
  34. Summary Residual herbicides (PRE and POST) are crucial for managing Palmer amaranth Milo-Pro (2 pt/A) and Reflex (1 pt/A) provided 96% and 99% control, respectively at 3 WA-PRE, the timing of the first POST application Milo-Pro was most effective as a POST applied herbicide when following Reflex PRE (residual and topical activity) A single application (2 pt/A POST1) or two applications (1 pt/A POST1 and POST2) of Milo-Pro provided 85% and 94% control, respectively, of GLY-R Palmer 2 WA-POST2 and carried the crop to layby and harvest According to these results, Milo-Pro may be a useful component in an INTEGRATED program to manage GLY-R Palmer amaranth