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ABSTRACT
Seven species aggregates of Trichoderma and Gliocladium virens were isolated from roots of Phellinus weirii-infested Douglas-fir stumps fumigated with chloropicrin, Vorlex, or methylisothiocyanate, or left untreated. Most commonly isolated was Trichoderma viride, followed by T. hamatum, T. citrinoviride, G. virens, T. polysporum, T. saturnisporum, T. harzianum, and T. longibrachiatum. Roots from chloropicrin-treated stumps were more frequently colonized than those from untreated stumps, although T. citrinoviride was more frequently found in untreated stumps.