日本樱花褐斑穿孔病的发生和防治

日本樱花褐斑穿孔病主要危害樱花叶片，致使叶片大量提早脱落，严重影响树势。发病期在4～9月，7、8月发病率增加，9月病叶大量脱落。65％代森锌、75％百菌清（科能）、75％百菌清（达科宁）、50％多菌灵4种农药防治樱花褐斑穿孔病，4月底开始喷药，10d左右1次，共喷4次，防治效果分别达95．1％、91．0％、86．3％、76．1％，可以在生产中推广应用。

Incidence and Control of Brown Shot Hole of Japanese Cherry Blossom

The brown shot hole of Japanese cherry blossom infects leaves, causes them early falling and affects the growth potential of the plant seriously. The disease begins in April, arrives at the peak during July to August, and the infected leaves fall massively in September. To control the occurrence of brown shot hole of Japanese cherry blossom,4 kinds of pesticide, namely Zineb, Chlorothalonil（Keneng）, Chlorothalonil（Dakening）, Carbendazim, were used in the late of April by spraying, per ten days once, continuously 4 times, and the affect of controlling was well, which was 95.1%,91.0%,86.3% ,76.1% respectively.