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棉苗立枯病,俗称棉花黑根病、烂根病、腰折病。主要为害棉苗,常造成断垄,重病年份大量死苗,甚至毁种,严重影响棉花的产量和品质。此外还侵染水稻、小麦、玉米、花生、芝麻等。一、发病症状(表1)二、发病规律病原半知菌亚门真菌立枯丝核菌,主要营寄生生活,也可腐生。病菌主要以菌丝体和菌核在土壤中或病残体上越冬。收花前遇低温多雨年份棉铃染病时,病菌侵入铃内,造成种子带菌,成为翌年初侵染源。
Cotton seedling blight, commonly known as cotton black root disease, rotten root disease, waist fold disease. The main damage to cotton seedlings, often resulting in broken ridge, severely ill year a large number of dead seedlings, or even destroyed species, seriously affecting the yield and quality of cotton. In addition also invaded rice, wheat, corn, peanuts, sesame seeds and so on. First, the incidence of symptoms (Table 1) Second, the incidence of pathogenic Candidiasis subfamilies submerged rhizoctonia, the main camp parasitic life, but also saprophytic. Pathogens mainly mycelium and sclerotia in the soil or sick overwintering. Received low temperature and rainy days before cotton bollworm disease, the bacteria invade the bell, causing the seed carrier, a source of infection the following year.