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炭疽病为害兰叶,受侵染部位初出现细小的褐斑点,随后逐渐扩大,形成椭圆形、半圆形或不规则中心淡黄褐色或灰白色,边缘显深色,稍有凹陷的斑痕。约1个月左右病斑干枯散放孢子,扩大侵染。严重时叶片枯黄。该病多在霉雨季节或高温高湿条件下发生,新芽梢最易染病,严重时整株枯死。预防及防治措施1、设置挡雨设施,避雨莳养,保证通风透光,搭棚遮荫,可减少发病率。控制水湿,尽量避免叶面喷水。合理施肥,增施磷钾肥,增强兰花抗病性。
Anthracnose-harmed blue leaf, the infected site early appeared small brown spots, and then gradually expanded to form oval, semicircular or irregular center of light brown or gray, the edge of the dark, slightly concave mark. About 1 month or so spots scattered spores, expand the infection. Serious yellow leaves. The disease mostly in the moldy rainy season or high temperature and humidity conditions occur, shoots the most susceptible to disease, severe whole plant died. Prevention and control measures 1, set up rain shelter facilities, shelter from rain, to ensure ventilation, scaffolding shading, can reduce the incidence. Control water wet, try to avoid foliar spray. Rational fertilization, increased phosphorus and potassium fertilizer, orchid disease resistance.