EVALUATION OF FLORASULAM FOR BROADLEAF WEED CONTROL IN BERMUDAGRSS.  T. Reed and P. McCullough; Department of Crop and Soil Sciences, University of Georgia, Griffin, GA 30223.  A. Alexander; Dow AgroSciences Turf & Ornamental Business, Lawrenceville, GA 30042.

ABSTRACT

Field experiments were conducted to evaluate efficacy of florasulam applications with dithiopyr for annual and perennial broadleaf weed control in two common bermudagrass (Cynodon dactylon) lawns in Griffin, GA.  Treatments were applied on February 13 and March 12, 2012 and single versus sequential applications were evalauted.  Weeds evaluated included catsear dandelion (Hypochoeris radicata), common dandelion (Taraxacum officinale), common chickweed (Stellaria media), corn speedwell (Veronica arvensis), henbit (Lamium amplexicaule), parsley-piert (Aphanes arvensi), and white clover (Trifolium repens).  Bermudagrass had no injury from treatments and greenup was not inhibited from the untreated.  Single applications of florasulam at 15 g ai/ha with dithiopyr provided excellent control (>90%) of common chickweed and white clover and good control (80 to 89%) of henbit.  However, control was poor (<70%) on other weeds evaluated.  Sequential florasulam applications generally improved control compared to single treatments and provided excellent control of common chickweed, and white clover; good control of catsear dandelion, corn speedwell, and henbit; and fair control (70 to 79%) of parsley-piert and common dandelion.