Slide Presentation

TITLE    (click title to view slides)

AUTHORS
Eric P. Prostko
Extension Weed Specialist

Tim L. Grey and William K. Vencill
Research Weed Scientists

University of Georgia

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TABLE OF CONTENTS
  1. Summarizing 5 Years of Corn Weed Management Research in Georgia 2001-2005
  2. What have we done? 2001-2005
  3. Should you use the RR corn system?
  4. Texas Panicum Control At Harvest with Single or Split Applications of Roundup WM - II
  5. Corn Yield Response to Single or Split Applications of glyphosate
  6. Glyphosate Resistance Around the World (8 species)
  7. 2005 GR-Pigweed Survey
  8. Preserving the Value of Glyphosate
  9. Herbicide programs for managing glyphosate and ALS-resistant Palmer amaranth in Georgia field corn.
  10. Texas Panicum Control
  11. Accent vs Option Summary: Texas Panicum Control
  12. Texas Panicum Control (104 DAT) - II: Accent vs Option - 2004
  13. Harvest-Aid Research
  14. Harvest-Aid - 2004
  15. Tropical spiderwort (a.k.a. Benghal dayflower) Commelina benghalensis
  16. TSW in Georgia
  17. Tropical Spiderwort Control in Field Corn - 2005
  18. Post-Harvest -- Field Corn (Our Achilles Heel?)
  19. Post-Harvest - 2005
  20. The Future
  21. UGA Weed Science



SLIDE CONTENTS
  1. Summarizing 5 Years of Weed Management Research in Georgia 2001-2005 Eric P. Prostko Extension Weed Specialist and Tim L. Grey and William K. Vencill Research Weed Scientists
  2. What have we done? 2001-2005 63 field trials Major areas of emphasis RR corn systems LL corn systems Accent vs. Option harvest-aids tropical spiderwort In-crop Post-harvest other new products Aim Callisto, Lexar/Lumax
  3. Should you use the RR corn system? advantages Inexpensive easy Broad spectrum Reduced drift concerns No soil insecticide issues disadvantages No residual over-reliance on a single product Herbicide resistance concerns Volunteer in other RR crops
  4. Texas Panicum Control At Harvest with Single or Split Applications of Roundup WM - II CN-04-04 (Attapulgus) Untreated Roundup WM @ 22 ozs/A 21 DAP Roundup WM @ 22 ozs/A 21 + 35 DAP
  5. Corn Yield Response to Single or Split Applications of glyphosate (4.5 lb ae/gal) @ 22 ozs/A. Average of 6 irrigated locations (2003-05) DKC67-60RR
  6. Glyphosate Resistance Around the World (8 species) rigid ryegrass (1996) goosegrass (1997) horseweed (2000) Italian ryegrass (2001) hairy fleabane (2003) buckhorn plantain (2003) common ragweed (2004) Palmer amaranth (2005) In Central Georgia * Can be found in US
  7. 2005 GR-Pigweed Survey
  8. Preserving the Value of Glyphosate tank-mix 2,4-D in burndown when glyphosate will be used in-crop Consider paraquat if appropriate Alternate glyphosate use with other herbicide modes of action Tank-mix with atrazine in corn Use other practices such as cultivation Do not allow weed escapes to produce seed
  9. Herbicide programs for managing glyphosate and ALS-resistant Palmer amaranth in Georgia field corn.
  10. Texas Panicum Control OR
  11. Accent vs Option Summary Texas Panicum Control 8 field trials Accent > Option 9 of 32 comparisons (28% of time) Option > Accent 1 of 32 comparisons (3% of time) Accent = Option 22 of 32 comparisons (69% of time) No statistical differences in corn yield were observed in any trial!
  12. 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
  13. Harvest-Aid Research
  14. Harvest-Aid - 2004 Untreated Roundup WM @ 22 oz/A Roundup WM @ 22 oz/A + Aim 2EC @ 1 oz/A + COC @ 1% v/v 15 DAT
  15. Tropical spiderwort (a.k.a. Benghal dayflower) Commelina benghalensis tropical Africa native annual or perennial seeds and rhizomes above and below ground flowers 1,600 seeds/plant alternate host of southern root-knot nematode Reservoir for southern stem blight (white mold)
  16. TSW in Georgia * confirmed in 29 counties by GA Dept. of Ag and UGA in 2004 (blue) * identified in 4 more counties in 2005 (black)
  17. Tropical Spiderwort Control in Field Corn - 2005 Untreated (166 bu/A) Aim 2EC @ 1.5 ozs/A Dual Magnum 7.62EC @ 1.33 pt/A Herbimax @ 1% v/v (168 bu/A) 34 DAT $24/A treatment cost (excluding application)
  18. Post-Harvest Field Corn (Our Achilles heel?)
  19. Post-Harvest 2005 2,4-D (1 pt/A) + Dual Magnum (12 ozs/A) + COC (1% v/v) 22 DAT 43 DAT 54 DAT * * * Grady County $12/A Treatment cost (excluding application)
  20. The Future Liberty Link? Products labeled but not yet tested in GA Impact (AmVac) Stout (DuPont) New products being developed KIH-485 Post-harvest for tropical spiderwort others??
  21. www.gaweed.com