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TITLE    (click title to view slides)
Weed Control Update for Peanut, Field Corn, and Sunflowers

AUTHOR
Dr. Eric P. Prostko
Extension Weed Specialist
University of Georgia
Tifton, GA

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TABLE OF CONTENTS
  1. 2004 Weed Control Update (Peanut, Field Corn, Sunflowers)
  2. Topic for Discussion
  3. Peanuts
  4. Peanuts - Valor Formulations
  5. Peanut yield response to Valor (3 ozs/A) formulation and timing
  6. Peanuts - Arrow 2EC
  7. Texas Panicum Control with POST Grass Herbicides (44 DAT)
  8. Peanuts - Prowl H20
  9. Peanut Yield Response to PRE Applications of DNA Herbicides
  10. Peanuts - New Metolachlor Formulations
  11. Field Corn
  12. Field Corn - Option vs. Accent
  13. Texas Panicum Control in Field Corn- I (Accent and Option)
  14. Texas Panicum Control in Field Corn- II (Accent and Option)
  15. Corn Yields with Accent and Option
  16. Accent vs. Option - Attapulgus - 2003 (19 DAT)
  17. Field Corn - Aim (Harvest-Aid)
  18. Field Corn - Basis Gold vs. Steadfast ATZ
  19. Corn Hybrid Herbicide Susceptibility Charts
  20. Field Corn - RR Corn Issues
  21. U.S. Corn Acres Planted to Herbicide Resistant Varieties
  22. Sunflowers
  23. Sunflowers - Dual Magnum
  24. Sunflowers - IMI-Tolerant (Clearfield)
  25. Weed Control in IMI (Clearfield) Sunflowers - Attapulgus, GA 2003 (60 DAT)
  26. Problems Worthy of Note in 2003
  27. Glyphosate Mishaps in Peanut!
  28. Roundup WeatherMax vs. Crop Oil
  29. Groundcherry spp.
  30. Eclipta
  31. Hophornbeam Copperleaf
  32. Does this field have a weed problem?
  33. A closer look?
  34. University of Georgia Extension Weed Science



SLIDE CONTENTS
  1. Dr. Eric P. Prostko Extension Weed Specialist Dept. Crop & Soil Sciences University of Georgia December 2003 2004 Weed Control Update (Peanut, Field Corn, Sunflowers)
  2. Topic for Discussion Peanuts Field Corn Sunflowers? Problems questions
  3. Peanuts Valor Formulations Arrow Prowl H20 newer metolachlor formulations
  4. Peanuts Valor Formulations 2001: 51 WDG 2002-03: 51 WP 2004: Valor SX 51WDG * smaller particles * dispersing agents * easier to get into suspension
  5. Peanut yield response to Valor (3 ozs/A) formulation and timing. PE-02-03 Attapulgus P = 0.80 CV = 12
  6. Peanuts Arrow 2EC clethodim POST grass control in broadleaf crops generic Select Makhteshim-Agan 6 -16 ozs/A price/service
  7. Texas Panicum Control with POST Grass Herbicides (44 DAT) PE-19-03 Ponder Farm Applied to 2-4” tall grass
  8. Peanuts Prowl H20 2004 3.8 lbs/gal 2.0 pts/A water-based micro-encapsulated less staining better for strip-tillage? increased price
  9. Peanut Yield Response to PRE Applications of DNA Herbicides PE-11-03 Ponder Farm P = 0.346 2 pts/A 3 pts/A 1.8 pts/A 2.4 pts/A 1.6 pts/A 2.1 pts/A
  10. Peanuts New Metolachlor Formulations Cinch Dupont same as Dual II Magnum Stalwart C Sipcam Agro USA Inc. “old” Dual EC formulation (7.8 lbs/gal) not labeled for peanut Me-Too-Lachlor Drexel “old Dual EC formulation (8 lbs/gal) rates are too low
  11. Field Corn Option vs. Accent Aim (harvest-aid) Basis Gold vs. Steadfast ATZ RR corn issues Pioneer RR corn hybrids glyphosate timings
  12. Field Corn Option vs. Accent POST grass control except crabgrass OP/SU interaction roughly same cost/A similar weed control and yields in UGA tests
  13. Texas Panicum Control in Field Corn- I Accent and Option CN-03-03 Ponder Farm Applied 24 DAP PANTE = 1”; 2-3LF
  14. Texas Panicum Control in Field Corn- II Accent and Option CN-04-03 Attapulgus Applied 24 DAP PANTE = 2”; 2-5 LF
  15. Corn Yields with Accent and Option a a CN-03-03 CN-04-03 b ab a c
  16. Accent vs. Option Attapulgus - 2003 (19 DAT) Untreated Accent @ 0.67 ozs/A Agrioil @ 1% v/v Option @ 1.5 ozs/A MSO @ 1.25% v/v AMS @ 3 lbs/A Applied 24 DAP/0.25-2” tall PANTE
  17. Field Corn Aim (Harvest-Aid) 24C label in GA, MS, LA, NC up to 1.9 ozs/A COC @ 1% v/v 3 day PHI morningglories pigweeds weak on sicklepod
  18. Field Corn Basis Gold vs. Steadfast ATZ 3 way mixes of atrazine/Accent/Matrix Steadfast has more Accent Both have greater potential to cause crop injury confirm hybrid tolerance
  19. Corn Hybrid Herbicide Susceptibility Charts
  20. Field Corn RR Corn Issues RR Corn 2 (NK 603 event) Up to 30” tall (over-the-top) 30-48” tall (drop nozzles) higher in-crop use rates/A (64 ozs vs 44 ozs RUWM) Pioneer will have several varieties Will this change the game?
  21. U.S. Corn Acres Planted to Herbicide Resistant Varieties Source: NASS
  22. Sunflowers Dual Magnum label IMI-Tolerant sunflowers (Clearfield)
  23. Sunflowers Dual Magnum PPI or PRE 1-1.33 pts/A coarse soils with 3% or less OM
  24. Sunflowers IMI-Tolerant (Clearfield) Mycogen seed 8N429CL non-GMO Beyond 1AS imazamox 4 ozs/A 2-8 leaf stage less rotation restrictions than other imi’s cotton = 9 months
  25. Weed Control in IMI (Clearfield) Sunflowers Attapulgus, GA 2003 (60 DAT) Untreated Beyond 1AS @ 4 ozs/A AMS @ 3 lbs/A 80/20 @ 0.25% v/v Prowl 3.3EC @ 2.4 pts/A over entire test.
  26. Problems Worthy of Note in 2003 misapplications of glyphosate rain-free periods FL pusley unusually unusual weed problems groundcherry eclipta copperleaf
  27. Glyphosate Mishaps in Peanut!
  28. Roundup WeatherMax vs. Crop Oil
  29. Groundcherry spp. SWSS SWSS
  30. Eclipta
  31. Hophornbeam Copperleaf
  32. Does this field have a weed problem?
  33. A closer look?
  34. University of Georgia Extension Weed Science (gaweed.com)