1. J.T. Brosnan, Ph.D.
T.J. Samples, Ph.D.
UT Lifetime Learning Program
February 18th, 2010
Knoxville, TN

2. Identification

3. http://www.tennesseeturfgrassweeds.org

4. http://www.tennesseeturfgrassweeds.org

5. http://www.tennesseeturfgrassweeds.org

6. Wild Garlic
Perennial from bulb
Hollow, cylindrical stems
Foliage aromatic when crushed

8. Star of
Bethlehem
 Sob pic
Perennial from bulb
Hollow stems
Foliage NOT aromatic when crushed

9. White
mid-rib

11. Henbit
Square Stem
Hairy
No Petiole on
Upper Portions

12. Purple
Deadnettle
 Henbit, deadnettle pics
Petioles
Purple in color when mature

14. Common
Chickweed
 Chickweed pic
Wet, shady areas
Egg shaped leaves

16. Mouse-ear
Chickweed

17.  Rough, athletic fields, home lawn
Annual Bluegrass

18. Photo by Bob Raley

19. Photo by Bob Raley

20. What are the products?
TRADE ACTIVE
NAME INGREDIENT

21. What are the products ?
TRADE NAME ACTIVE INGREDIENT

22. 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

23. Spot Treatments
Follow the label
1-1.5% solution
WILL KILL DESIRABLE VEGETATION

25. Preemergence
Crabgrass Control

26. Photo by: D.F. Lewis

27. Photo by: D.F. Lewis

28. Hairy Crabgrass
Smooth Crabgrass

29. PREEMERGENCE

30. PREEMERGENCE
BEFORE

31. PREEMERGENCE
BEFORE YOU CAN SEE IT

32.  Soil
temp ≥55°F
for 3 consecutive
days and nights

33. All PRE products
effective
(>90% control)
in 2010 for up to
100 days after
application

34. What are the products?
TRADE NAME ACTIVE INGREDIENT
Dimension dithiopyr
Pendulum pendimethalin
Barricade prodiamine
Ronstar oxadiazon**

35. Formulations

39. At least ½” irrigation within 24 hrs
of application

40.  Seeding pic
DO NOT APPLY IF YOU PLAN TO SEED

41. I missed
my
crabgrass
timing!!!!

42.  Dimension
 Tenacity
 Acclaim Extra
 Fusilade II
 Drive XLR8
 MSMA
 MSMA + Sencor

43. Cultural Practices to Increase Turf
Density

44. AIR

47. 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

48. Without Nitrogen With Nitrogen
Photo Courtesy of M.J. Schlossberg

49. MOW, MOW, MOW !!

51. Indicator Weeds

52. Goosegrass

54. Prostrate Knotweed

57. Good Balance of Air and Water

58. Improve Soil Conditions

59. Move the
Traffic Pattern

60. White Clover
clover

63. Yellow Nutsedge
Nutsedge
 Bermuda infestation pic

65. Install Drainage ?

66. Over Irrigating ?

67. Summary
 Identification
 Product Selection
 Cultural Practices
 Indicators
 Resources

68. http://www.tennesseeturfgrassweeds.org

69. http://www.tennesseeturfgrassweeds.org

70. http://www.tennesseeturfgrassweeds.org

71. http://www.tennesseeturfgrassweeds.org

72. http://www.tennesseeturfgrassweeds.org

73. Questions?