Slide Presentation

TITLE    (click title to view slides)
Non-Selective Herbicides for Winter Weed Control in Non-overseeded Bermudagrass

AUTHOR
Dr. Tim R. Murphy
Extension Weed Scientist
University of Georgia
Griffin, GA

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TABLE OF CONTENTS
  1. Non-Selective Herbicides for Winter Weed Control in Non-overseeded Bermudagrass
  2. Traditional Control Program
  3. Triazine Issues
  4. Chattahoochee - USGS
  5. 2,4-D Controversy
  6. Need For Alternatives
  7. Non-Selective, Non-Residual
  8. Non-selective Options
  9. Scythe
  10. Reward LS
  11. Roundup Pro
  12. Finale
  13. Effect of dormant applications on green-up
  14. Effect of transition applications on green-up
  15. Effect of dormant applications on henbit control
  16. Effect of transition applications on henbit control
  17. Effect of dormant applications on common chickweed control
  18. Effect of transition applications on common chickweed control
  19. Effect of dormant applications on corn speedwell control
  20. Effect of transition applications on corn speedwell control
  21. Effect of dormant applications on parsley-piert control
  22. Effect of transition applications on parsley-piert control
  23. Effect of dormant applications on white clover control
  24. Effect of transition applications on white clover control
  25. Summary - Green-up
  26. Summary - Henbit
  27. Summary - Common Chickweed
  28. Summary - Corn Speedwell
  29. Summary - Parsley-piert
  30. Summary - White Clover
  31. Methods
  32. Methods
  33. Application information



SLIDE CONTENTS
  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. PPT Slide 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 NS NS LSD 11 *
  14. Effect of transition applications on green-up LSD 6 LSD 11 LSD 15 * * * * * * * * * *
  15. Effect of dormant applications on henbit control. * LSD 11 NS NS
  16. Effect of transition applications on henbit control * * LSD 15 NS LSD 9
  17. Effect of dormant applications on common chickweed control * LSD 7 NS LSD 17 * *
  18. Effect of transition applications on common chickweed control LSD 19 NS NS *
  19. Effect of dormant applications on corn speedwell control * LSD 12 LSD 14 LSD 12 * * *
  20. Effect of transition applications on corn speedwell control LSD 11 LSD 12 LSD 12 * * *
  21. Effect of dormant applications on parsley-piert control * LSD 23 LSD 23 LSD 28 * * *
  22. Effect of transition applications on parsley-piert control LSD 22 NS LSD 27 * *
  23. Effect of dormant applications on white clover control LSD 13 LSD 23 LSD 30 * * * * * * * * *
  24. Effect of transition applications on white clover control LSD 21 LSD 30 LSD 20 * * * * * * * * *
  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 (អ%) 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