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2005 Weed Control Update - Peanut, Field Corn, Soybeans, Sunflowers

AUTHOR
Dr. Eric P. Prostko
Extension Weed Specialist
Dept. Crop & Soil Sciences
University of Georgia

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TABLE OF CONTENTS
  1. 2005 Weed Control Update - Peanut, Field Corn, Soybeans, Sunflowers
  2. Peanuts
  3. Spartan in Peanut
  4. Spartan Rotation Restrictions
  5. Spartan Injury
  6. Cobra in Peanut
  7. Metolachlor Mysteries?
  8. Metolachlor Prices
  9. Tropical Spiderwort
  10. Tropical Spiderwort Response to Dual Magnum and Stalwart, Grady Co., 2004 - I
  11. Tropical Spiderwort Response to Dual Magnum and Stalwart, Grady Co., 2004 - II
  12. Valor Issues: Is that hose clean?
  13. Valor and Sprayer Cleanup
  14. Which plot had AMS? (Both had Cadre at 1.44 ozs/A + Agrioil @ 1% v/v applied 24 DAP)
  15. Which plot had AMS?
  16. Field Corn
  17. Field Corn Option vs. Accent
  18. Texas Panicum Control - I Accent vs Option - 2004
  19. Texas Panicum Control - II Accent vs Option - 2004
  20. Texas Panicum Control - III Accent vs Option - 2004
  21. Texas Panicum Control (104 DAT) - II Accent vs Option - 2004
  22. Conventional or RR Systems?
  23. Are the RR hybrids any good?
  24. Use Rates for Glyphosate in RR Corn
  25. Soybeans
  26. Nutsedge Management in RR Soybeans
  27. Controlling RR Cotton in RR Soybeans
  28. Glyphosate/Manganese Tank-Mixes
  29. Sequence for Weed Control in RR Soybeans
  30. Tropical Spiderwort Management in RR Soybeans
  31. To Prevent Yield Loss in RR Soybeans
  32. Sunflowers
  33. UGA Extension Weed Science (gaweed.com)



SLIDE CONTENTS
  1. Dr. Eric P. Prostko Extension Weed Specialist Dept. Crop & Soil Sciences University of Georgia December 2004 2005 Weed Control Update (Peanut, Field Corn, Soybeans, Sunflowers)
  2. Peanuts Spartan Cobra newer metolachlor formulations Valor Issues others issues
  3. Spartan in Peanut Labeled in 2004 not in FL 4F formulation 4.8 to 8.0 ozs/A soil-applied broadleaf weed control nutsedge cotton rotation concerns crop injury on lighter soils PPO inhibitor
  4. Spartan Rotation Restrictions
  5. Spartan Injury
  6. Cobra in Peanut Labeled in Fall 2004 postemergence 6 leaf peanut 90 day PHI 12.5 ozs/A broadleaf weed control a hotter Blazer tank-mixes with Basagran, Cadre, Pursuit, Select, 2,4-DB PPO inhibitor
  7. Metolachlor Mysteries? 9 formulations in marketplace new metolachlors (88% s + 12% r) Dual Magnum, Dual II Magnum (Syngenta) Cinch (DuPont) old metolachlors (50% s + 50% r) Stalwart, Stalwart C (Sipcam) Me-Too-Lachlor, Me-Too-Lachlor II (Drexel) Parallel PCS, Parallel (Makhteshim-Agan)
  8. Metolachlor Prices *only labeled for use in field corn and popcorn
  9. Tropical Spiderwort
  10. Tropical Spiderwort Response to Dual Magnum and Stalwart, Grady Co., 2004 - I Applied PRE at 1 pt/A. *
  11. Tropical Spiderwort Response to Dual Magnum and Stalwart, Grady Co., 2004 - II Applied POST at 1 pt/A with glyphosate to 3” tall COMBE. *
  12. Valor Issues: Is that hose clean? Tank/Line Rinsate Line in Glyphosate
  13. Valor and Sprayer Cleanup
  14. Which plot had AMS? (Both had Cadre at 1.44 ozs/A + Agrioil @ 1% v/v applied 24 DAP) PE-08-04 July 1 ,2004 28 DAT
  15. Which plot had AMS? PE-08-04 August 3, 2004 54 DAT 403 404
  16. Field Corn Option vs. Accent RR corn issues glyphosate timings
  17. Field Corn Option vs. Accent POST grass control except crabgrass OP/SU interaction roughly same cost/A 2004 Option was less effective than Accent
  18. Texas Panicum Control - I Accent vs Option - 2004 CN-03-04 (Ponder Farm) Applied 22 DAP PANTE = 1”, 3-4 leaf a a abc bcd b c c d
  19. Texas Panicum Control - II Accent vs Option - 2004 CN-04-04 (Attapulgus) Applied 21 DAP PANTE = 1-2”, 2-4 leaf ab b a b a b a b
  20. Texas Panicum Control - III Accent vs Option - 2004 CN-06-04 (Attapulgus) Applied 21 DAP PANTE = 1-2”, 3-4 leaf ab ab ab abc a ab a bcd
  21. Texas Panicum Control (104 DAT) - II Accent vs Option - 2004 CN-04-04 (Attapulgus) Applied 21 DAP PANTE = 1-2”, 2-4 leaf Untreated Accent @ 0.67 ozs/A Agrioil @ 1% v/v Option @ 1.5 ozs/A MSO @ 1.25% v/v AMS @ 3 lbs/A
  22. Conventional or RR Systems?
  23. Are the RR hybrids any good? CN-07-04 b b a a a a a
  24. Use Rates for Glyphosate in RR Corn
  25. Soybeans Nutsedge control in RR beans RR cotton in RR soybeans Mn tank-mixes Sequence tropical spiderwort glyphosate timings
  26. Nutsedge Management in RR Soybeans split applications of glyphosate better on purple than yellow tank-mix with Classic controls yellow suppresses purple tank-mix with Pursuit better on purple than yellow rotations/cost
  27. Controlling RR Cotton in RR Soybeans Canopy - PRE metribuzin + chlorimuron 8 ozs/A POST glyphosate tank-mixes Resource (4 ozs/A) Reflex (12 ozs/A) Classic (0.33 ozs/A) need PRE fb POST to be most effective
  28. Glyphosate/Manganese Tank-Mixes research from VA has shown that Mn will reduce weed control when tank-mixed with glyphosate 9 to 38% reductions depending upon species Mn not a problem with Blazer, Classic, Pursuit, or Basagran. Sources: Bailey et al., 2002 (Weed Technology 16:792-799) and Heckman et al., 1999 (Journal of Production Agriculture 12:445-448)
  29. Sequence for Weed Control in RR Soybeans label in October 2004 mixture of glyphosate -K + Dual Magnum 2.5 -3.0 pts/A $/15-18/A 0.70 ae + 0.94 ai (2.5 pts) 0.84 ae + 1.13 ai (3.0 pts) prior to 3rd trifoliate tropical spiderwort?
  30. Tropical Spiderwort Management in RR Soybeans Use Dual Magnum or generic PRE in known fields tank-mix Pursuit or Classic with glyphosate Extreme 2.17SC @ 3 pts/A = glyphosate (0.75 lb ai/A) + Pursuit (0.063 lb ai/A)
  31. To Prevent Yield Loss in RR Soybeans control weeds by 4-5 weeks after planting or control weeds before they reach 6-9” in height or control weeds before the V3 stage Source: Purdue University Extension Weed Science Group, 2004 (4.7 million acres of RR soybeans planted)
  32. Sunflowers Spartan PPI or PRE 4F @ 3-3.75 ozs/A only soil applied broadleaf herbicide registered
  33. University of Georgia Extension Weed Science (gaweed.com)