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兰花炭疽病菌在病叶组织内越冬,4月上、中旬初次侵染,分生孢子能再次侵染。病害发生期为4～11月,其中4～8月为老叶发病期,7～11月为新叶发病期。病害发生与温度、湿度、降雨量和雨日有关。病害流行的最适气温为25℃左右,相对湿度85％以上,雨量大、雨日长发病严重。病害程度与品种有关,春兰、寒兰、和秋兰均发病严重;台兰发病较轻。在病害发生期使用1％波尔多液及75％百菌清、50％稻瘟酞、25％培福朗、50％代森锰锌等1000倍液,有明显的防治效果,其防效达75％以上。
Colletotrichum orchid anthropogenic bacteria in the diseased leaves in the winter, April, mid-first infection, conidia can re-infection. Disease occurs from April to November, of which 4 to August is the incidence of old leaves, 7 to November for the onset of new leaves. Disease occurs with temperature, humidity, rainfall and rainy days. Prevalence of epidemic optimum temperature of about 25 ℃, relative humidity above 85%, rainfall, rainy days, severe disease. The degree of disease is related to variety, Chunlan, Hanlan, and Qiulan are all severely ill; 1% Bordeaux mixture and 75% Chlorothalonil, 50% Pyrethrum, 25% Peifulun, 50% Mancozeb and other 1000 times liquid were used in disease occurrence stage. %the above.