根据你寄来的标本和你信上所介绍的情况分析,我们认为是桃细菌性穿孔病。此病除为害桃树外,还为害杏、李、樱桃等果树。这种病主要发生在叶片上,果实和枝梢上也能发生。叶片感病后,先在叶背靠叶脉处出现水渍状小病斑,随之叶面也出现。病斑逐渐扩大呈圆形或不规则形,红褐色至褐色,周围有淡黄色的晕圈。以后病斑干枯,脱落成孔洞。叶片受害严重时常造成 Based on the specimen you sent and your analysis on the letter, we consider peach bacterial perforation. In addition to the disease harmful peach trees, but also harmful apricot, plum, cherry and other fruit trees. This disease occurs mainly in the leaves, fruit and shoots can also occur. Sick leaves, the first leaflet at the veins of water-like small spot, along with foliage also appear. Lesions gradually enlarged round or irregular shape, reddish brown to brown, surrounded by a halo of light yellow. After the lesion dry, shedding into holes. Serious damage caused by leaves often