Abstract
Dalapon (2,2-dichloropropionic acid), tebuthiuron {N-[5-(1,1-dimethylethyl)-1,3,4-thiadiazol-2-yl]-N,N′-dimethylurea}, and hexazinone [3-cyclohexyl-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4(1H,3H)-dione] were evaluated for smutgrass [Sporobolus poiretii(R.&S.) Hitchc] control in bahiagrass (Paspalum notatumFlugge.) pastures. Dalapon and hexazinone provided the best smutgrass control but injured the bahiagrass. Forage treated with hexazinone at 1.7 kg/ha or less recovered within 6 months; however, the effects of the initial injury from dalapon at 2.2 kg/ha could be detected for as long as 2 yr after treatment. Dogfennel [Eupatorium capillifolium(Lam.) Small] and broomsedge (Andropogon virginicusL.) replaced smutgrass and bahiagrass removed by dalapon. Higher rates of tebuthiuron than hexazinone (3.4 vs. 1.1 kg/ha) were required to control smutgrass adequately.
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