Abstract
Established cultures of Phytophthora infestans grow well on an agar medium containing KH2PO4, MgSO4, glucose, asparagine, thiamine, yeast extract and casamino acids. Zoospores when germinated on this medium, however, produce a few sparingly branched hyphae only, and very few continue growth to form colonies. The addition of apple pectin induces a much higher percentage of the sporelings to continue growth to form colonies, but even then all sporelings may not continue development, and other factors appear to be involved. The further development of the sporeling was much more readily inhibited by streptomycin and ultraviolet radiation than was germination.
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