棉花烂铃病在河北省主要是棉疫病所引起的,它的症状是,在棉铃基部或铃缝处开始出现水浸状病斑,形状不规则,边缘无明显界限。病斑扩展极快,3—5天整个铃壳腐烂。典型病铃,铃面生出白色霜状孢子层;但是铃面腐烂后,常感染多种弱寄生菌,而生出白、黄、粉红、灰褐、 Cotton boll disease is mainly caused by cotton epidemic disease in Hebei Province. Its symptom is the appearance of the flooded lesions at the base or bell-seam of cotton bolls, with irregular shape and no obvious boundary. Very rapid expansion of lesions, 3-5 days the entire bell shell decay. The typical sick bell, bell fried white spore layer gives birth to a spore layer; but the bell surface decay, often infected with a variety of weak parasites, and give birth to white, yellow, pink, gray brown,