The hyperparasite Ampelomyces quisqualis and its host diversity in Laoshan Mountain of Qingdao
青岛崂山的重寄生菌白粉寄生孢及其寄主多样性

One hundred and forty-three powdery mildew fungus samples collected from 35 species of plants belonging to 30 genera of 16 families in Laoshan Mountain of Qingdao during 2005 and 2007 were morphologically identified as 22 species of 7 genera. Of which 40 samples were found to be colonized by Ampelomyces quisqualis. Further investigations indicate that its host plants include 15 species belonging to 14 genera of 8 families, and its host powdery mildew fungi include 10 species belonging to 7 genera. The statistical analyses showed that A. quisqualis had the highest incidence and intensity of mycoparasitism on Arthrocladiella mougeotii. The analyses of community composition implied that Sphaerotheca fusca was the dominant host fungus of A. quisqualis with the highest importance value of 89.22%. Asteraceae, with the highest importance value of 97.85%, was the dominant host plant family.