Abstract: The pest species and epidemic regularity of Callerya speciosa were studied through field investigation. A randomized block design was used to compare the control effects of different pesticides on powdery mildew of Callerya speciosa and explore the best green control technology. The results showed that there were few diseases and insect pests in Callerya speciosa, but it was easy to infect diseases and insect pests in seedling stage, mainly including root rot, rust, powdery mildew, anthracnose, downy mildew, leaf blight, root knot nematode and aphid. Five fungicides were effective in controlling the powdery mildew of Callerya speciosa. The control effect of 25% triadimefon was 98.0%, 42% oligosaccharides · sulfur was 89.0%, 1% osthole was 76.8%, 0.5% physcion was 27.6%, Trichoderma harzianum was 13.8%. 25% triadimefon, 42% oligosaccharides · sulfur and 1% osthole had the best control effect, and there was no significant difference among them. The best green control technology for powdery mildew of Callerya speciosa is intermingled use of 42% oligosaccharides · sulfur and 1% osthole.

Key words: Callerya speciosa, diseases and insect pests, powdery mildew, control technology