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An Aphanomyces disease occurred on Dutch iris, Iris hollandica Hort., growing in Nara Prefecture, Japan. The disease was characterized by yellowing of the leaf tips and damping-off after soft rotting of the subterranean parts. Follwing a preliminary morphological comparison with five known species of Aphanomyces which are parasitic on the roots of phanerogam seedlings, the causal fungus was considered to be similar to A. euteiches or A. raphani. However, outgrowths from the dorsal surface of the male organ found in A. euteiches or occasionally in A. raphani have not been observed in this iris pathogen. Pathogenicity was also restricted to several species of iris. Thus, the present fungus is considered as a new species and the name Aphanomyces iridis is proposed. Dried material of the isolate is designated as the type specimen (IMI280194).

Aphanomyces iridis sp. nov. causing Aphanomyces basal rot of Dutch iris in Japan.