Intraracial variation inPhytophthora infestans, and its relationship to different host varieties

摘要

A comparative study of the magnitude of growth rate variation among isolates ofPhytophthora infestans(Mont.) de Bary taken from a high and a low field resistant variety of potato has shown it to be greater in the former than in the latter, even though both crops were infected by the same population of the pathogen. Competition between spores, and adaptation to the varieties, are put forward as possible alternative explanations.