2011 Basics of Weed Control

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2011 Basics of Weed Control

  1. 1. J.T. Brosnan, Ph.D. T.J. Samples, Ph.D.UT Lifetime Learning Program February 18th, 2010 Knoxville, TN
  2. 2. Identification
  3. 3. http://www.tennesseeturfgrassweeds.org
  4. 4. http://www.tennesseeturfgrassweeds.org
  5. 5. http://www.tennesseeturfgrassweeds.org
  6. 6. Wild Garlic Perennial from bulb Hollow, cylindrical stems Foliage aromatic when crushed
  7. 7. Star ofBethlehem Sob pic Perennial from bulb Hollow stems Foliage NOT aromatic when crushed
  8. 8. Whitemid-rib
  9. 9. Henbit Square Stem HairyNo Petiole onUpper Portions
  10. 10. PurpleDeadnettle Henbit, deadnettle pics Petioles Purple in color when mature
  11. 11. Common Chickweed Chickweed pic Wet, shady areas Egg shaped leaves
  12. 12. Mouse-earChickweed
  13. 13.  Rough, athletic fields, home lawn Annual Bluegrass
  14. 14. Photo by Bob Raley
  15. 15. Photo by Bob Raley
  16. 16. What are the products?TRADE ACTIVENAME INGREDIENT
  17. 17. What are the products ?TRADE NAME ACTIVE INGREDIENT
  18. 18. What Now??? Glyphosate (Roundup) •  < 1 pt/A as broadcast •  COMPLETELY DORMANT BERMUDAGRASS •  Combine with PRE?? Phenoxy herbicides •  Three-Way/Weed-B-Gone on TF and B •  Dismiss for SOB No poa products for homeowners  Revolver for LCOs on B
  19. 19. Spot Treatments Follow the label 1-1.5% solutionWILL KILL DESIRABLE VEGETATION
  20. 20. PreemergenceCrabgrass Control
  21. 21. Photo by: D.F. Lewis
  22. 22. Photo by: D.F. Lewis
  23. 23. Hairy CrabgrassSmooth Crabgrass
  24. 24. PREEMERGENCE
  25. 25. PREEMERGENCEBEFORE
  26. 26. PREEMERGENCEBEFORE YOU CAN SEE IT
  27. 27.   Soil temp ≥55°Ffor 3 consecutivedays and nights
  28. 28. All PRE products effective (>90% control) in 2010 for up to 100 days after application
  29. 29. What are the products?TRADE NAME ACTIVE INGREDIENTDimension dithiopyrPendulum pendimethalinBarricade prodiamine Ronstar oxadiazon**
  30. 30. Formulations
  31. 31. At least ½” irrigation within 24 hrs of application
  32. 32.  Seeding picDO NOT APPLY IF YOU PLAN TO SEED
  33. 33. I missed mycrabgrasstiming!!!!
  34. 34.   Dimension  Tenacity  Acclaim Extra  Fusilade II  Drive XLR8  MSMA  MSMA + Sencor
  35. 35. Cultural Practices to Increase Turf Density
  36. 36. AIR
  37. 37. Fertility Bermudagrass lawns •  1 lb N/1000 sq. ft •  Every month of growing season Tall fescue lawns •  ½ lb N/1000 sq. ft.   APRIL, MAY •  1 lb N/1000 sq. ft.   SEPTEMBER, OCTOBER, NOVEMBER
  38. 38. Without Nitrogen With Nitrogen Photo Courtesy of M.J. Schlossberg
  39. 39. MOW, MOW, MOW !!
  40. 40. Indicator Weeds
  41. 41. Goosegrass
  42. 42. Prostrate Knotweed
  43. 43. Good Balance of Air and Water
  44. 44. Improve Soil Conditions
  45. 45. Move theTraffic Pattern
  46. 46. White Clover clover
  47. 47. Yellow Nutsedge Nutsedge Bermuda infestation pic
  48. 48. Install Drainage ?
  49. 49. Over Irrigating ?
  50. 50. Summary Identification Product Selection Cultural Practices Indicators Resources
  51. 51. http://www.tennesseeturfgrassweeds.org
  52. 52. http://www.tennesseeturfgrassweeds.org
  53. 53. http://www.tennesseeturfgrassweeds.org
  54. 54. http://www.tennesseeturfgrassweeds.org
  55. 55. http://www.tennesseeturfgrassweeds.org
  56. 56. Questions?

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