In using the inner epidermis of Phaseolu8 vulgaris pods as host .tissue and Sclerotinia jructicola and Phytophthora infestans as pathogens which interact in a hypersensitive fashion, a principle (or principles?) was separated from the former which exerts a strongly inhibitory effect on the growth of the latter. It is shown that this principle (phytoalexin):
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K. O. Müller (1958) studied this question.