Interactions Among Fungi Causing Postharvest Decay of Pear

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Abstract
Phialophora malorum and Cladosporium herbarum cause decay lesions on pears [Pyrus communis] that are indistinguishable without isolating the causal fungus. Only P. malorum was isolated from lesions on benomyl-treated fruit sampled from a commercial packinghouse, whereas only C. herbarum was found in lesions on untreated fruit. When inoculated simultaneously into pear wounds, both fungi were recovered from decay lesions after 4 mo. When one fungus was inoculated before the other, the first inoculated was more frequently isolated in pure culture from lesions. Benomyl selectively controlled infection by C. herbarum without inhibiting infection by P. malorum. Wounds inoculated from Penicillium expansum and either Phialophora malorum or C. herbarum developed lesions from which only P. expansum was recovered, but sterile filtrate of Penicillium expansum did not inhibit infection by Phialophora malorum or C. herbarum.

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