Abstract
Ampelomyces quisqualis produced pycnidia but not conidia on malt-yeast extract (MY) agar, while in MY broth the fungus formed both pycnidia and conidia in 7 days. Shaking the culture greatly increased the amount of conidia produced in MY broth. Among the vegetables tested, carrot broth was best for conidial formation under shaking conditions, followed by tomato broth and cucumber broth. The fungus failed to grow in potato broth. When A. quisqualis conidia produced in carrot broth were incubated together with Oidium euonymi-japonicae conidia on glass slides under moist conditions, parasitism of this mycoparasite on its powdery host was observed for the first time outside the host of the powdery mildew.
