SUMMARY1. A previously undescribed species of Papulospora, isolated from soil, is described.2. This species has been found to be parasitic on R. solani by both an internal and an external type of parasitism.3. The parasitism of the Papulospora on R. solani has been found, in pot tests, to be effective in reducing the amount of sugar beet black-root caused by R. solani.
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John K. Warren (1948) studied this question.
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