Postinfectional inhibitors from plants. VII. Tolerance of capsidiol by fungal pathogens of pepper fruit

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Abstract
Alternaria alternata and Fusarium oxysporum were isolated from field-grown peppers (Capsicum frutescens L.) and the antifungal sesquiterpene, capsidiol, was demonstrated in A. alternata lesions. In laboratory experiments, both fungi induced strongly antifungal diffusates and the activity was shown to be due to their content of capsidiol, or in the case of F. oxysporum to a combination of capsidiol and capsenone. Growth of the non-pathogen Monilinia fructicola was completely inhibited by the A. alternate diffusate at one-eighth and by the F. oxysporum diffusate at one-quarter of the original concentration. The inducing fungi were also inhibited by their own diffusates 80% and 50% respectively but, in spite of this, effectively parasitized fruit tissue.

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