Abstract
The antifungal activity of the herbicides bialaphos and glufosinate, the active moiety of bialaphos, was assessed. Bialaphos showed a higher level of in vitro antifungal activity againstRhizoctonia solani, Sclerotinia homoeocarpa, andPythium aphanidermatumthan glufosinate. Glufosinate suppressed the mycelial growth ofR. solaniandS. homoeocarpa, but it had no inhibitory effect onP. aphanidermatumup to the highest concentration in our testing regimes. Various concentrations of bialaphos solutions were applied to transgenic, bialaphos- and glufosinate-resistant creeping bentgrass inoculated with fungal pathogens. Bialaphos applications were able to significantly reduce symptomatic infection byR. solaniandS. homoeocarpaon transgenic plants. Bialaphos significantly inhibitedP. aphanidermatum, but not to the same degree thatR. solaniandS. homoeocarpawere inhibited. These results indicate that bialaphos may provide a means for the simultaneous control of weeds and fungal pathogens in turf areas with transgenic, bialaphos-resistant creeping bentgrass.
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