Control ofPythiumspp. and Pythium Blight of Turfgrass with Fosetyl Aluminum

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Abstract
Fosetyl aluminum showed no toxicity to 25 isolates of Pythium [P. aphanidermatum, P. torulosum, P. dissodocum, P. periplocum, P. mamillatum, P. graminicolum, P. ultimum, P. artotrogas], representing 8 spp., on potato-dextose agar amended with 1, 10 and 100 .mu.g a.i.[active ingredient]/ml agar. Field control of Pythium blight with fosetyl aluminum was evaluated on ''Pennfine'' perennial ryegrass (Lolium perenne L.). At 1 wk postspray, 114 and 228 g/93 m2 provided 87 and 100% symptom suppression, respectively. Residual efficacy diminished gradually, and at 4 wk posttreatment, the 228-g rate provided 43% control. In the absence of direct fungitoxicity to species of Pythium, field control of Pythium blight on ryegrass may result from elicitation of antifungal responses in the host.