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Characterization of Phytophthora infestans in Wisconsin from 1993 to 1995

April 1998 , Volume 82 , Number  4
Pages  434 - 436

K. D. Marshall-Farrar , Former Graduate Student , M. McGrath , Research Associate , R. V. James , Senior Research Specialist , and W. R. Stevenson , Professor, Department of Plant Pathology, University of Wisconsin-Madison 53706

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Accepted for publication 29 December 1997.

Late blight of potato (Solanum tuberosum), caused by Phytophthora infestans, recently reappeared in Wisconsin and was a significant production problem in 1994. P. infestans isolates collected in Wisconsin from 1993 to 1995 were characterized for the following traits: mating type, sensitivity to metalaxyl, and allozyme genotype for Glucose-6-phosphate isomerase (Gpi). Characterization of these isolates revealed that a new, more aggressive population (A2 mating type, metalaxyl resistant, and Gpi genotype 100/111/122) is displacing the old population (A1 mating type, metalaxyl sensitive, and Gpi genotype 86/100) in Wisconsin.

Additional keyword: Ridomil

© 1998 The American Phytopathological Society