1 / 33

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.

yeva
Télécharger la présentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related