Symptoms: Buxus macrophylla leaves are damaged, and the leaves of the damaged plants are shriveled and deformed, which affects the growth. Powdery mildew is mostly distributed in the front of Euonymus japonicus leaves, and rarely grows on the back of leaves. The single lesion is round, and the white lesion is irregular after expansion and healing.
Prevention and control methods:
(1) Prune properly to enhance permeability.
(2) Spraying 25% triadimefon 1300 times solution, 70% thiophanate-methyl 700 times solution and 50% wettable powder 800 times solution alternately at the initial stage of the disease. If the disease is serious, it must be pruned, the diseased leaves cut off and burned, and then sprayed with chemicals to prevent it.