Severe cottony leak was found on stems of scarlet runner bean (Phaseolus coccineus) in Ibaraki Prefecture in August 2006. The causal fungus was identified as Pythium aphanidermatum. The name cottony leak of scarlet runner bean (Watagusare-byo in Japanese) is proposed for this new disease.

Cl 85:15 which methyl has replaced phenylseleno.19 The transformation of 8 to 9 proceeds with allylic rearrangement giving a mixture of cis and trans isomers. The route from 1 to 8 to 9 results in overall 1,3 disubstitution of an allyl fragment, first by an electrophile, then by a nucleophile. Cinnamyl phenyl selenide gives unrearranged olefin (1-phenyl-l-butene, 65%) upon treatment with dimethylcuprate in ether. Alkylation products of phenyl crotyl selenide (i.e., 10) undergo reaction with dimethylcuprate sluggishly, and the reaction is likely to be limited to the less highly substituted allyl selenides such as 8. Aryl selenides with electron-attracting substituents may undergo more facile displacements by cuprate, and we are exploring this possibility. cal Society, the National Science Foundation, and the Wisconsin Alumni Research Foundation provided generous support for this work.

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