Effect of Imazalil on Pathogenicity ofPenicilliumspp. Causing Storage Rots of Pome Fruits

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Abstract
Imazalil failed to control storage rot of pome fruits caused by Penicillium spp. when the compound was first introduced into commerical use. Isolates of Penicillium obtained from decayed, treated fruit were pathogenic and almost 4 times less sensitive to imazalil than was the common storage rot fungus, P. expansum. These isolates, identified as P. crustosum, could not compete with P. expansum unless imazalil was present, but caused fruit decay when imazalil at 500 .mu.g a.i./ml [active ingredient] of water treatment or water plus diphenylamine was applied to harvested fruit.

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