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1.叶片穿孔病叶片穿孔病是叶片的主要病害,多在夏秋季发生。病叶上形成针头大的紫色小斑点,随后小斑点逐渐扩大并互相接合,成为圆形褐色病斑,直径约1—5毫米,病斑上还着生黑色小点。最后病斑干枯穿孔,叶片脱落。大紫品种易感病,红灯、那翁等品种不易感病。防治此病应在秋季落叶后清扫病叶,集中烧毁。春季发芽前,全树喷3—5度石硫合剂,6—7月发病初期可喷布两次240倍过量式波尔多液,或甲基托布津800—1000倍液。
1 leaf perforation disease leaf perforation disease is the main leaf disease, mostly in summer and autumn. Sick leaves form a small purple spot on the needle, then the small spots gradually expand and join each other to become a round brown lesion with a diameter of about 1-5 mm, spotted with black dots. The last spot dry perforation, leaves off. Large purple varieties susceptible to disease, red light, that Weng and other varieties are not susceptible to disease. Prevention and treatment of the disease should be swept leaves in autumn after deciduous, concentrated burned. Before spring germination, the whole tree spray 3-5 degrees lime sulfur mixture, early onset of 6-7 months can be sprayed twice 240 times excess Bordeaux mixture, or methyl thiophanate 800-1000 times.