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棉花烂铃是由多种病菌共同作用而引发的复合性病害。烂铃可严重影响棉花产量和品质。一般年份造成产量损失15％～20％。重发生年份产量损失达50％以上。 近年,有关单位通过对烂铃病原菌鉴定,明确了烂铃是以苎麻疫霉菌为主的多种病原菌综合引起的一种棉铃病害。病菌以卵孢子的形态在土壤中越冬,且不受土壤环境的影响,萌发的孢子可侵染棉苗,引起棉苗发病。在棉花蕾铃期,病原菌形成的孢子囊释放的孢子借助于风雨和昆虫等传播侵染棉株,引起棉铃发病。棉花发育期间低温(24～27℃)、多雨(雨日3～5 d)及虫害重则是诱发烂铃发生流行的外部生态环境条件。棉花烂铃的发生与花序
Cotton boll is caused by a variety of bacteria together caused by the complex disease. Bad bell can seriously affect the yield and quality of cotton. The general year caused 15% ~ 20% loss of production. Occurred in the weight loss of more than 50% of the year. In recent years, the relevant agencies through the identification of rotten bell pathogens, clear rotten bell is a ramie Phytophthora mainly caused by a variety of pathogens a cotton boll disease. Pathogens in the form of oospores in the winter soil, and not affected by the soil environment, germination of spores can infect cotton seedlings, causing cotton seedling disease. In cotton boll stage, spores released by sporangia formed by pathogens invade cotton plants by means of wind, rain and insects, causing cotton boll disease. Low temperature (24-27 ℃), rainy days (3-5 days on rainy days) and pest infestation during cotton development are the external ecological conditions that induce the occurrence of rotten bell. Occurrence of cotton boll and inflorescence