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An extensive ssurvey was conducted on the occurrence of hyperparasites (HP) on powdery milew species in Korea during $1991{\sim}1994$ seasons. As a result, a total of 1070 materials infected with powdery mildew fungi were collected. Of these, 92 ones were infected with the HP; 6 with the ...

An extensive ssurvey was conducted on the occurrence of hyperparasites (HP) on powdery milew species in Korea during $1991{\sim}1994$ seasons. As a result, a total of 1070 materials infected with powdery mildew fungi were collected. Of these, 92 ones were infected with the HP; 6 with the unidentified HP and the rest 86 with Ampelomyces quisqualis. This showed infection of powdery mildew species with HP was common phenomenon in nature and A. quisqualis was the most common HP in Korea. To prove the hyperparasitism of A. quisqualis, 24 isolates from 32 collections in 1992 year were successfully cultured. All isolates tested were hyperparasitic to cucumber powdery mildew, Sphaerotheca fusca.

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