棉花早衰是棉花生产中普遍发生的现象,对棉花的产量影响极大,一般棉田减产10%～20%,严重地块可减产50%以上。一般年份,棉株8月份以后就逐渐表现衰老症状:叶片变薄而发黄或发红,甚至干枯脱落,上部果枝不能伸展,蕾小、花弱、铃小,落花落蕾增多,棉株上部可出现顶心发硬、红茎到顶,严重棉株过早死亡。早衰的棉株一般出现在土质僵硬、土壤肥力较差的棉田,或施 Premature senescence of cotton is a common phenomenon in cotton production, which has a great impact on the cotton yield. Generally, the cotton yield is reduced by 10% to 20% in most cotton fields, and it can be reduced by more than 50% in severe land plots. In general years, cotton plants gradually show the symptoms of aging after August: the leaves become thin and yellow or red, and even dry off, the upper fruit branch can not stretch, the bud is small, weak flowers, small bell, falling flower buds increased, cotton plant upper There may be top-core hard hair, red stem to the top, severe cotton plant premature death. Premature aging cotton plants generally appear in the soil stiff, poor soil fertility cotton fields, or facilities