2011 Basics of Weed Control

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

Identification

http://www.tennesseeturfgrassweeds.org

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

Star ofBethlehem Sob pic Perennial from bulb Hollow stems Foliage NOT aromatic when crushed

Whitemid-rib

Henbit Square Stem HairyNo Petiole onUpper Portions

PurpleDeadnettle Henbit, deadnettle pics Petioles Purple in color when mature

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

Mouse-earChickweed

 Rough, athletic fields, home lawn Annual Bluegrass

Photo by Bob Raley

What are the products?TRADE ACTIVENAME 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% solutionWILL KILL DESIRABLE VEGETATION

PreemergenceCrabgrass Control

Photo by: D.F. Lewis

Hairy CrabgrassSmooth Crabgrass

PREEMERGENCE

PREEMERGENCEBEFORE

PREEMERGENCEBEFORE YOU CAN SEE IT

  Soil temp ≥55°Ffor 3 consecutivedays and nights

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

What are the products?TRADE NAME ACTIVE INGREDIENTDimension dithiopyrPendulum pendimethalinBarricade prodiamine Ronstar oxadiazon**

Formulations

At least ½” irrigation within 24 hrs of application

 Seeding picDO NOT APPLY IF YOU PLAN TO SEED

I missed mycrabgrasstiming!!!!

  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

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

MOW, MOW, MOW !!

Indicator Weeds

Goosegrass

Prostrate Knotweed

Good Balance of Air and Water

Improve Soil Conditions

Move theTraffic Pattern

White Clover clover

Yellow Nutsedge Nutsedge Bermuda infestation pic

Install Drainage ?

Over Irrigating ?

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

http://www.tennesseeturfgrassweeds.org

Questions?

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2011 Basics of Weed Control

by University of Tennessee Office of Alumni Affairs

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