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Non-Selective Herbicides for Winter Weed Control in Non-overseeded Bermudagrass

Non-Selective Herbicides for Winter Weed Control in Non-overseeded Bermudagrass. Dr. Tim R. Murphy Extension Weed Specialist University of Georgia Griffin. Traditional Control Program. Triazine - based Annual broadleaf weeds + annual bluegrass Flexible application timing Low in cost.

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Non-Selective Herbicides for Winter Weed Control in Non-overseeded Bermudagrass

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  1. Non-Selective Herbicides for Winter Weed Control in Non-overseeded Bermudagrass Dr. Tim R. Murphy Extension Weed Specialist University of Georgia Griffin

  2. Traditional Control Program • Triazine - based • Annual broadleaf weeds + annual bluegrass • Flexible application timing • Low in cost

  3. Triazine Issues • Under special review - EPA • Toxicological implications • Triazine-resistant weeds • Ground and surface water detects • Chattahoochee River study - USGS

  4. Chattahoochee - USGS

  5. 2,4-D Controversy • Non-Hodgkins Lymphoma

  6. Need for Alternatives

  7. Non-Selective, Non-Residual • Broad spectrum • Fast-acting - Reward LS, Scythe • Slow-acting - Roundup Pro • No soil residual • Repeat applications ?? • Effect on spring transition

  8. Non-selective Options • Roundup Pro - glyphosate • Reward LS - diquat • Finale - glufosinate • Scythe - pelargonic acid

  9. Scythe • Fast-acting, membrane disrupter • Soil persistence - < 2 days • Rate - 5 to 10% v/v • Applications at < 60 F. may be less effective

  10. Reward LS • Fast-acting, membrane disrupter • Soil persistence - T1/2 = 1,000 days • Immobile in soil • Sorption - almost irreversible • Rate - 0.25 to 0.5 lbs. ai/acre

  11. Roundup Pro • Slow acting, inhibits amino acid synthesis • Soil persistence - T 1/2 = 47 days • Very low leaching potential • Rapid adsorption to soil • Rate = up to 0.5 lbs. ai/acre

  12. Finale • Intermediate activity • Inhibits nitrogen metabolism • Soil persistence - T 1/2 = 7 days • Highly mobile in soils • Rapid microbial degradation • Rate - 0.5 to 1.5 lbs. ai/acre • NL in dormant turf - 1997

  13. Effect of dormant applications on green-up LSD 11 * NS NS

  14. Effect of transition applications on green-up LSD 11 LSD 15 LSD 6 * * * * * * * * * *

  15. Effect of dormant applications on henbit control. NS NS LSD 11 *

  16. Effect of transition applications on henbit control LSD 9 NS LSD 15 * *

  17. Effect of dormant applications on common chickweed control NS LSD 17 LSD 7 * * *

  18. Effect of transition applications on common chickweed control NS NS LSD 19 *

  19. Effect of dormant applications on corn speedwell control LSD 14 LSD 12 LSD 12 * * * *

  20. Effect of transition applications on corn speedwell control LSD 12 LSD 12 LSD 11 * * *

  21. Effect of dormant applications on parsley-piert control LSD 23 LSD 28 LSD 23 * * * *

  22. Effect of transition applications on parsley-piert control LSD 27 NS LSD 22 * *

  23. Effect of dormant applications on white clover control LSD 23 LSD 30 LSD 13 * * * * * * * * *

  24. Effect of transition applications on white clover control LSD 20 LSD 30 LSD 21 * * * * * * * * *

  25. Summary - Green-up • No effect for dormant applications. • Applied at 40% green-up, length of delay was: • Reward 0.25 lbs. - 14 days • Reward 0.25 + 0.25 lbs. - 21days • Reward 0.5 lbs. - 21 days • Roundup Pro - 42 days (58) • Finale - 34 days

  26. Summary - Henbit • Reward & Finale > Roundup Pro 7 DAA • At 21 DAA all products equally effective

  27. Summary - Common Chickweed • Applied to dormant turf, Reward > Roundup Pro & Finale at 7 DAA • No difference at 14 DAA • At 42 DAA, Reward 0.25 < Reward at 0.5, Roundup Pro & Finale • Applied during transition, Reward & Finale > Roundup Pro at 7 DAA only

  28. Summary - Corn Speedwell • Applied to dormant turf, Reward and Finale > Roundup Pro at 7 DAA • Reward at 0.25 (40%) and 0.5 (47%) < Roundup Pro (95%) and Finale (83%) at 42 DAA • Applied during transition, Reward and Finale > Roundup Pro 14 DAA • Reward at 0.5 (98%) and Finale (100%) > Roundup Pro (85%) at 21 DAA

  29. Summary - Parsley-piert • Applied to dormant turf, Reward and Finale > Roundup Pro at 7 DAA • Reward at 0.25 (53%) and 0.5 (60%) < Roundup Pro (97%) and Finale (98%) at 42 DAA • Applied during transition, Reward and Finale > Roundup Pro 14 DAA • No differences at 21 DAA

  30. Summary - White Clover • Applied to dormant turf, Finale > Reward and Roundup Pro from 7 through 42 DAA • Applied during transition, Reward at 0.25 (48%) and 0.5 (67%) and Finale (72%) > Roundup Pro (23%) at 7 DAA • Finale (99%) > Reward (<50%) and Roundup Pro (67%) at 21 DAA

  31. Methods • Established ‘Tifway’ bermudagrass • Plots 6.5 by 15.0 ft. • RCBD, 3 replications • Non-irrigated site

  32. Methods • Dormant applications - February 18, 1997 • Transition applications - March 11, 1997 • CO2 Backpack • 25 gpa

  33. Application information

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