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棉花苗期病害是棉花生育期中的重要病害,在我县发生较为普遍,对棉花造成不同程度的危害,主要有危害根茎部的炭疽病、立枯病、猝倒病等,危害叶部的褐斑病、轮纹病等。一般年份发病20%-30%,死苗5%,重发生年份发病达50%以上,死苗20%-30%,特别是近年来,此类病害在我县发生较为严重。一、棉花苗期病害与天气、土壤的关系棉花出苗前低温,使棉子出苗时间延长,容易造成烂种;棉苗出土后15天左右,棉种内养分基本耗尽,根系发育又不充分,组织的
Cotton seedling disease is an important disease during cotton growth period, occurs more commonly in our county, causing different degrees of damage to cotton, mainly endangering rhizome anthracnose, blight, damping off disease, endangering brown leaves Spot disease, ring pattern and so on. In general, the incidence of 20% -30%, dead seedlings 5%, re-occurrence of more than 50% of the incidence of dead Miao 20% -30%, especially in recent years, such diseases occurred more serious in our county. First, the cotton seedling disease and the weather, the relationship between the soil Cotton pre-emergence of low temperature, so that the emergence of cotton seedling time is extended, likely to cause rotten species; about 15 days after the emergence of cotton seedlings, the basic nutrient depletion of cotton seedlings, root development is not sufficient ,organizational