Abstract
The ballistospore-forming yeast Tilletiopsis was recovered from powdery mildew-infected leaves of 22 plant species in the lower Fraser Valley of British Columbia, Canada, during 1990-1992. A semiselective medium, comprised of corn meal agar, ampicillin (100 μg/ml), dichloran (10 μg/ml), and rose bengal (20 μg/ml), was developed to enhance recovery of Tilletiopsis isolates from nature. Among a total of 143 isolates, four species-T. washingtonensis, T. minor, T. pallescens, and T. albescens-were recovered in decreasing frequencies. Two isolates, one of T. pallescens and one of T. washingtonensis, were evaluated for their growth response to environmental factors and efficacy in reducing powdery mildew growth and sporulation [...]
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