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“Oh Where, Oh Where Has My Pigweed Control Gone” (An Update on ALS-Resistance)

“Oh Where, Oh Where Has My Pigweed Control Gone” (An Update on ALS-Resistance). Eric P. Prostko Extension Weed Specialist Department of Crop & Soil Sciences The University of Georgia Tifton. GCPA - 2005. Pigweed Problems in 2005.

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“Oh Where, Oh Where Has My Pigweed Control Gone” (An Update on ALS-Resistance)

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  1. “Oh Where, Oh Where Has My Pigweed Control Gone” (An Update on ALS-Resistance) Eric P. Prostko Extension Weed Specialist Department of Crop & Soil Sciences The University of Georgia Tifton GCPA - 2005

  2. Pigweed Problems in 2005

  3. 6” Pigweed Treated with 4X Rate of Cadre - Grady County (20 DAT)

  4. weed size** moisture temperature humidity rate nozzle type GPA calibration bad luck herbicide resistance Causes of Herbicide Failures All possible reasons for poor performance should be investigated before considering the possibility of resistance!!!

  5. ALS-Resistance Around the World • 93 species have developed resistance world-wide • 36 species in U.S. • Why? • very popular • low use rates • environment friendly • single sites of action • major MOA development in late 1980’s early 1990’s

  6. Herbicide Resistant WeedsBy Mode of Action

  7. Accent Ally Beacon Cadre Classic Envoke Exceed Express Finesse FirstRate Harmony Extra Osprey Peak Permit/Sandea Pursuit Python Scepter Staple Strongarm Commonly Used ALS Herbicides

  8. Herbicide Resistance in Georgia

  9. Other Counties in Georgia with Documented ALS-Resistant Palmer Amaranth • Tested by BASF in 2005 • Colquitt • Cook • Mitchell • 166 locations were also sampled by UGA weed scientists in 2005 • ALS and glyphosate * * *

  10. 2005 ALS-Resistant Pigweed Survey61 samples, 21 counties

  11. If ALS-Resistance is Suspected • Prowl or Sonalan • What about DNA-resistance? • Cautious use of …… • Classic • Cadre • Pursuit • Strongarm • Consider adding….. • Valor • Dual Magnum • Outlook • Don’t be afraid of Gramoxone • Ultra Blazer or Cobra • Tank-mix with Cadre

  12. Do you need Gramoxone? Gramoxone Max @ 8 ozs/A + Pledge @ 8 ozs/A + NIS @ 0.25% v/v (15 DAP) Fb Cadre @ 1 oz/A + COC @ 1% v/v (31 DAP) (2736 lbs/A) Untreated (1471 lbs/A) Cadre @ 1 oz/A + COC @ 1% v/v (31 DAP) (2235 lbs/A) PE-08-05 July 20, 2005 (79 DAP) Attapulgus

  13. Postemergence Herbicide ApplicationsTimeliness is the Key!!!!

  14. Palmer Amaranth Control with Blazer Applied at Different Timings Source: Mayo et al., 1995 Weed Technology 9:141-147

  15. Am I worried about ALS-Resistant Pigweed in Peanuts? • The problem is real! • It is more widespread than we would like to think. • We have plenty of tools but …. • We have to use them. • Increased production costs

  16. More Information About Herbicide Resistance • UGA Weed Science Web-Site * http://gaweed.com • International Survey of Resistant Weeds * http://www.weedscience.org/in.asp

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