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Agricultural Lessons Learned in 2007: Weather, Problems, and Herbicides in Focus

Explore key events of 2007 in agriculture, from weather challenges to herbicide issues like resistant weeds, mixing errors, and new solutions. Learn from the successes and setbacks of the past to improve future practices.

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Agricultural Lessons Learned in 2007: Weather, Problems, and Herbicides in Focus

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  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) - 5.58 -11.31 -9.59 Source: GEMN

  4. April 8, 2007 Georgia FreezeMinimum 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 AmaranthMacon 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 Reflex • Staple: 9-10 months • Envoke: 210 days • Reflex: 10 months Staple

  10. Field Corn Yield Response to PRE Applications of Reflex 2SC - 2007 a a a a a a a a a a a a a a a a Bu/A b a b c c Average field half-life of Reflex is 100 days. Label restriction for corn is 10 months!

  11. PRE- Reflex 2L Injury to Corn 9 DAT NTC 16 oz/A 4 oz/A 8 oz/A 0.5 oz/A 2 oz/A 1 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 PeanutsMacon County, GA – 2007 (38 DAT) NTC Valor SX 51WG @ 3 oz/A

  21. GR-Palmer Amaranth Control in Field CornMay 31, 2007 (38 DAP) Roundup Original Max (22 oz/A) Atrazine (2 qt/A) Prowl H20 (2.1 pt/A) EPOST (18 DAP) NTC 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) KIH-485 85WG @ 1.67 oz/A (0.089 lb ai/A) NTC

  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 NTC PE-10-07

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