Lawn burweed is a serious problem in warm-season golf courses, sports fields, and residential turfgrass. Field studies were conducted at three sites in Florida to evaluate herbicides applied postemergence for control of lawn burweed. Mecoprop 2,4-D dicamba provided > 95% control of lawn burweed when evaluated 47 to 55 d after treatment (DAT). MCPA triclopyr dicamba in either ester or amine forms, 2,4-D triclopyr dicamba, triclopyr, 2,4-D, and bromoxynil provided 88 to 100% control 40 to 55 DAT. Although triclopyr clopyralid provided > 90% control in one study, it was not consistent and controlled < 75% of the lawn burweed present in another experiment. Simazine was unacceptable for lawn burweed control. Bermudagrass turf was not injured by any of the treatments evaluated. Mecoprop 2,4-D dicamba caused minimal short-term injury to centipedegrass.
Nomenclature: Bromoxynil; clopyralid; 2,4-D; dicamba; MCPA; mecoprop; simazine; triclopyr; common bermudagrass, Cynodon dactylon (L.) Pers. #3 CYNDA; common centipedegrass, Eremochloa ophioroides (Munro) Hack. # ERLOP; hybrid bermudagrass, Cynodon dactylon × C. transvaalensis Burtt-Davy ‘Tifway’; lawn burweed, Soliva pterosperma (Juss.) Less. # SOVPT.
Additional index words: Atrazine, bentazon, postemergence, preemergence.
Abbreviations: DAT, days after treatment; FWBGC, Fort Walton Beach Golf Club; WCHS, Whitfield Community Home Site; WFREC, West Florida Research and Education Center.
