Abstract
Smutgrass [Sporobolus poiretii (R. & S.) Hitchc.] was selectively controlled in carpetgrass (Axonopus affinis Chase) and common bermudagrass [Cynodon dactylon (L.) Pers.] with atrazine [2-chloro-4-(ethylamino) −6-(isopropylamino)-s-triazine] applied at 2.2 kg/ha in each of two applications. MSMA (monosodium methanearsonate) applied alone or in combination with 2,4-D [(2,4-dichlorophenoxy)acetic acid] at 2.2 + 0.6 kg/ha in each of three applications controlled at least 70% of smutgrass in two of three experiments. The common bermudagrass showed signs of atrazine injury during the first 6 weeks after treatment but the injury was not evident the following year. MSMA alone or in combination with 2,4-D killed carpetgrass in all experiments. Repeated treatments with bromacil (5-bromo-3-sec-butyl-6-methyluracil) applied alone or in combination with diuron [3-(3,4-dichlorophenyl)-1,1-dimethylurea] controlled smutgrass but severely injured the turfgrasses.
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