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枯萎病是棉花的致命性病害之一,在棉花整个生育期中都能发病,尤其以蕾期为重。病源菌可通过带病种子、病株残体、病土、带病饼肥、棉籽壳,以及人畜、农具、流水等蔓延传播。被害棉株结铃数及花蕾数显著减少,蕾铃脱落率增高,单铃重下降,衣指特别是籽指显著变小,种子成熟度差,纤维长度变短,强度降低。轻病棉田一般减产20—60％,重病棉田成片死亡,造成无收。棉花苗期,受枯萎病的危害,幼苗子叶变黄或紫红色,有时子叶和真叶叶片呈黄色网纹状。严重时,幼苗叶片局部或全部萎蔫,枯干死亡。棉花现蕾前后,
Fusarium wilt is one of the deadly diseases of cotton, which can occur during the whole growing period of cotton, especially in the bud stage. Pathogenic bacteria can be infected by the disease, diseased plant residues, soil disease, disease cake, cotton seed hulls, and livestock and poultry, farm tools, water spread spread. The numbers of bolls and buds of cotton bolls decreased significantly, the shedding rate of buds increased, the boll weight decreased, the index finger decreased significantly, the seed maturity was poor, the fiber length became shorter and the strength decreased. Slightly ill cotton fields generally cut 20-60%, seriously ill cotton fields into pieces, resulting in no income. Cotton seedling stage, the risk of blight, seedling leaves yellow or purple, and sometimes cotyledons and leaves true yellow veins. In severe cases, seedling leaves partially or completely wilting, withered death. Before and after cotton budding,