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1.立枯病1.1症状立枯病也叫猝倒病,是一种世界性病害,我国各地普遍发生。病害多在4～6月发生,根据发生的不同时期有4种症状:种芽腐烂型;茎叶腐烂型;幼苗猝倒型;苗木立枯型。此病害是侵染性病害,病原菌为镰刀孢菌、丝核菌和腐霉菌。1.2发病规律此病害主要危害幼苗,特别是出土1个月以内幼苗最易感病,发生后也易流行,2～3年苗木如不预防,也时有发生。其原因主要是前茬为瓜类或
1. Blight 1.1 Symptoms Blight also known as damping off disease, is a worldwide disease that occurs throughout our country. Diseases occur in 4 to 6 months, according to the occurrence of different periods have 4 kinds of symptoms: seed bud rot type; stem and leaf rot; seedling cataplexy type; This disease is an infectious disease, pathogenic bacteria Fusarium, Rhizoctonia and Pythium. 1.2 The incidence of disease The main hazards of this disease seedlings, especially the most susceptible seedlings within 1 month after the unearthed, but also easy to epidemic after 2 to 3 years if not prevent seedlings, but also from time to time. The main reason is that the former crop is melon or