Abstract
Thirty-six isolates of Phytophthora infestans originating from three different potato growing regions in the Netherlands were tested for their aggressiveness to leaves of potato cultivar Bintje under controlled conditions. Measurements of latent period, maximal growth rate, infection efficiency and sporulation intensity were made and a composite aggressiveness index was calculated. Large variation in aggressiveness was present among isolates for each regional P. infestans population studied. The three populations differed significantly in latent period, but not for maximal growth rate and infection efficiency. Phenotypic variation existed for all components of aggressiveness and the aggressiveness index in P. infestans from each regional source. No association was found between mating type and aggressiveness. It is concluded that high levels of variation for aggressiveness are being generated and maintained through sexual reproduction in P. infestans strains from regional potato growing practices.
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