Abstract
A study was made of motility of zoospores of six Phytophthora spp. in the confined environment of glass microbeads. Results indicated that different Phytophthora spp. are affected to varying degrees by the ‘contact stimulus’ phenomenon described by previous workers. Phytophthora cinnamomi was the least sensitive to contact stimulus. It is considered that zoospores of even the most sensitive species, P. megasperma var. megasperma and P. citricola, would retain motility long enough for this attribute to make an effective contribution to dispersal in soil microenvironments.
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