Slide Presentation

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

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TABLE OF CONTENTS
  1. Lessons Learned (or not) in 2007
  2. Topics For Discussion
  3. March-April-May Rainfall in Georgia (2007)
  4. April 8, 2007 Georgia Freeze
  5. Grady County
  6. Maximum Air Temperatures in Georgia (August 4 - August 15, 2007)
  7. Problems
  8. Triazine Resistant Palmer Amaranth Macon County 2007
  9. Cotton Herbicides/Corn Rotations
  10. Field Corn Yield Response to PRE Applications of Reflex 2SC - 2007
  11. PRE- Reflex 2L Injury to Corn 9 DAT
  12. Provost (10.7 oz/A) + Fulbor + Penatrator Plus + 2,4-DB
  13. Butoxone
  14. Injury
  15. Injury
  16. Be careful when mixing!! Staple, Envoke, Cadre are not a good idea on soybeans!!!!
  17. Controlling RR Cotton in RR Soybeans
  18. Can we manage pigweed???
  19. Managing Palmer Amaranth
  20. Spray POST’s when weeds are small!!!!
  21. GR-Palmer Amaranth Control in Soybean - 2007 (83 DAT)
  22. Palmer Amaranth Control in Peanuts Macon County, GA - 2007 (38 DAT)
  23. GR-Palmer Amaranth Control in Field Corn May 31, 2007 (38 DAP)
  24. Palmer Amaranth Control in Sorghum-Sudangrass Silage
  25. A New Herbicide
  26. Texas Panicum Control in Field Corn with KIH-485 Applied PRE (53 DAT)
  27. Wild Radish Control in Field Corn with KIH-485 Applied PRE (43 DAT)
  28. Tropical Spiderwort Control in Peanuts with KIH-485 (2007) - 15 DAT
  29. The University of Georgia Cooperative Extension



SLIDE CONTENTS
  1. Lessons Learned (or not) in 2007 Eric P. Prostko Extension Weed Specialist Dept. of Crop & Soil Sciences
  2. Topics For Discussion Weather Drought, freeze, heat Problems Triazine resistance Corn rotations (Reflex, Staple) Provost contaminated 2,4-DB Mixing errors RR cotton in RR soybeans Will we be able to handle Palmer amaranth? A new herbicide?
  3. March-April-May Rainfall in Georgia (2007) Source: GEMN -11.31 -9.59 - 5.58
  4. April 8, 2007 Georgia Freeze Minimum Temperatures Source: GEMN
  5. Grady County
  6. Maximum Air Temperatures in Georgia (August 4 – August 15, 2007) Source: GEMN
  7. Problems
  8. Triazine Resistant Palmer Amaranth Macon County 2007 Atrazine 4L @ 1 qt/A (PRE) fb Atrazine 4L @ 1.5 qt/A + COC @1% v/v (POST) Photo 14 Days after POST 15-20 year rotation Ryegrass-corn-sorghum-sudangrass
  9. Cotton Herbicides/Corn Rotations Staple: 9-10 months Envoke: 210 days Reflex: 10 months Reflex Staple
  10. Field Corn Yield Response to PRE Applications of Reflex 2SC - 2007 a a a a a a a a c b a a a a a c b a a a a Average field half-life of Reflex is 100 days. Label restriction for corn is 10 months! Bu/A
  11. PRE- Reflex 2L Injury to Corn 9 DAT NTC 16 oz/A 8 oz/A 4 oz/A 2 oz/A 1 oz/A 0.5 oz/A
  12. Provost (10.7 oz/A) + Fulbor + Penatrator Plus + 2,4-DB Richard McDaniel, 2007
  13. Lot #’s EC-16 FB-01
  14. Be careful when mixing!! Staple, Envoke, Cadre are not a good idea on soybeans!!!!
  15. Controlling RR Cotton in RR Soybeans Preemergence Canopy 75DG (8 oz/A) Sencor 4L (8-12 oz/A) Sencor 75DF (5.3-8 oz/A) POST glyphosate tank-mixes 6” cotton, 3 leaves Resource (4 ozs/A) - 77% 2,4-DB (2 ozs/A) - 76% Reflex (12 ozs/A) - 72% Classic (0.33 ozs/A) - 62% PRE only = 54-87% POST only = 62-77% PRE + POST = > 95% Source: York et al., Weed Technology. 2004. 532-539.
  16. Can we manage pigweed???
  17. Managing Palmer Amaranth Know your enemy Resistant or not?? ALS or GR Residual herbicide activation Timely POST’s Avoid overusing PPO’s
  18. Spray POST’s when weeds are small!!!!
  19. GR-Palmer Amaranth Control in Soybean – 2007 (83 DAT) Untreated Prefix 5.2EC @ 2.03 pt/A SB-01-07
  20. Palmer Amaranth Control in Peanuts Macon County, GA – 2007 (38 DAT) NTC Valor SX 51WG @ 3 oz/A
  21. GR-Palmer Amaranth Control in Field Corn May 31, 2007 (38 DAP) NTC Roundup Original Max (22 oz/A) Atrazine (2 qt/A) Prowl H20 (2.1 pt/A) EPOST (18 DAP) CN-07-07
  22. Palmer Amaranth Control in Sorghum-Sudangrass Silage NTC 2,4-D amine @ 1 pt/A (27 DAT) GS-01-07
  23. A New Herbicide KIH-485 (pyroxasulfone) Kumiai corn and soybeans GA tests on peanuts and cotton MOA not well understood at this time Shoot inhibitor???? Similar to metolachlor?? Used at lower rates more active on Texas panicum
  24. Texas Panicum Control in Field Corn with KIH-485 Applied PRE (53 DAT) NTC KIH-485 85WG @ 4.2 oz/A (0.223 lb ai/A)
  25. Wild Radish Control in Field Corn with KIH-485 Applied PRE (43 DAT) NTC KIH-485 85WG @ 1.67 oz/A (0.089 lb ai/A)
  26. Tropical Spiderwort Control in Peanuts with KIH-485 (2007) – 15 DAT NTC Gramoxone Inteon @ 12 oz/A KIH-485 @ 4.2 oz/A Storm @ 12 oz/A 80/20 @ 0.25% v/v PE-10-07 NTC