Mutants of P. aphanidermatum resistant to both metalaxyl and fosetyl-Al were obtained following exposure of a metalaxyl-resistant field isolate to the chemical mutagen N-methyl-N'-nitro-N-nitrosoguanidine. Selected mutants were resistant to metalaxyl and phosphorous acid in vitro and exhibited in vitro growth rates and zoospore production that differed little from the metalaxyl-resistant parent(.)
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P. L. Sanders (1990) studied this question.
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