A chlorate-containing selective medium was developed for tracing chlorate-resistant, nitrate-nonutilizing (nit) mutants of pathogenic strains of Fusarium oxysporum. Neither wild-type strains of Fusarium spp. nor most of the fungi from six field soils could grow on this medium, whereas most nit mutants of six formae speciales grew on it. The nit mutants retained their pathogenicity. Survival in soil of nit mutants belonging to three formae speciales was comparable to that of their wild-type parents
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Esther Hadar (1989) studied this question.
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