Failure of Metalaxyl to Control Pythium Blight on Turfgrass in Pennsylvania

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Abstract
Sixty to 75% of the propagules of Pythium aphanidermatum recovered from a site where metalaxyl failed to control Pythium blight on turfgrass grew without inhibition on a medium containing 50 and 100 ppm of metalaxyl. Representative isolates were pathogenic on pot-grown bentgrass, producing symptoms typical of Pythium blight. These isolates were more aggressive than a pool of wild-type P. aphanidermatum and were not controlled by the commercial rate of metalaxyl on pot-grown bentgrass. They were adequately controlled in vivo by propamocarb and fosetyl Al.