棉花立枯病俗称烂腰、折倒病 ,是棉花苗期主要病害之一。该病常与碳疽病混合发生。苗未出土前可造成烂芽烂种 ,出土后半个月内危害幼苗茎基部。受害苗茎基部初产生黄褐色水渍状病斑 ,后逐渐扩大绕茎四周向下凹陷为黑褐色 ,严重时棉苗萎蔫 ,倒伏枯死。子叶被害产生棕色不规则病 Blight commonly known as bald rot, down sick, cotton is one of the major diseases at seedling stage. The disease often occurs with anthrax mixed. Seedlings are not unearthed before can cause rotten bud rotten, unearthed half a month after endangering seedling stem base. Harm seedlings at the base of the first generation of brown water stain like lesion, and gradually expanded around the stem around the depression for the dark brown, severe cotton seedlings wilting, lodging dead. Cotyledons produce brown irregularities