J.T. Brosnan, Ph.D. T.J. Samples, Ph.D.
UT Lifetime Learning Program February 18th, 2010
Knoxville, TN
http://www.tennesseeturfgrassweeds.org
http://www.tennesseeturfgrassweeds.org
http://www.tennesseeturfgrassweeds.org
Wild Garlic
Perennial from bulb Hollow, cylindrical stems
Foliage aromatic when crushed
Sob pic
Star of Bethlehem
Perennial from bulb Hollow stems
Foliage NOT aromatic when crushed
Henbit
Square Stem
Hairy
No Petiole on Upper Portions
Henbit, deadnettle pics
Purple Deadnettle
Petioles
Purple in color when mature
Chickweed pic
Common Chickweed
Wet, shady areas Egg shaped leaves
Mouse-ear Chickweed
Rough, athletic fields, home lawn
Annual Bluegrass
Photo by Bob Raley
Photo by Bob Raley
What are the products?
TRADE NAME
ACTIVE INGREDIENT
What are the products ?
TRADE NAME ACTIVE INGREDIENT
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
Spot Treatments
Follow the label 1-1.5% solution
WILL KILL DESIRABLE VEGETATION
Preemergence Crabgrass Control
Photo by: D.F. Lewis
Photo by: D.F. Lewis
Smooth Crabgrass
Hairy Crabgrass
PREEMERGENCE
BEFORE
PREEMERGENCE
BEFORE YOU CAN SEE IT
Soil temp ≥55°F for 3 consecutive days and nights
All PRE products effective
(>90% control) in 2010 for up to
100 days after application
What are the products? TRADE NAME ACTIVE INGREDIENT
Dimension
Pendulum
Barricade
Ronstar
dithiopyr
pendimethalin
prodiamine
oxadiazon**
At least ½” irrigation within 24 hrs of application
Seeding pic
DO NOT APPLY IF YOU PLAN TO SEED
I missed my
crabgrass timing!!!!
Dimension Tenacity
Acclaim Extra Fusilade II Drive XLR8 MSMA MSMA + Sencor
Cultural Practices to Increase Turf Density
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
With Nitrogen Without Nitrogen
Photo Courtesy of M.J. Schlossberg
Prostrate Knotweed
Good Balance of Air and Water
Improve Soil Conditions
Move the Traffic Pattern
clover White Clover
Nutsedge Bermuda infestation pic
Yellow Nutsedge
Install Drainage ?
Over Irrigating ?
Summary Identification Product Selection Cultural Practices Indicators
Resources
http://www.tennesseeturfgrassweeds.org
http://www.tennesseeturfgrassweeds.org
http://www.tennesseeturfgrassweeds.org
http://www.tennesseeturfgrassweeds.org
http://www.tennesseeturfgrassweeds.org