当棉花开花,结铃盛期,有的棉田的棉花叶片逐渐由绿转黄,进而变褐泛红,尚未完成生命周期就已经脱落,严重的落黄面积危及整个棉田。这种症状的出现最易误诊为急性黄萎病,其实是棉田缺钾所致的一种现象。棉花黄萎病多出现在开花、结铃高峰期,一般在7月下旬至8月发生,症状是棉花叶 When the cotton flowering and bolting period, some cotton leaves of cotton fields gradually turn from green to yellow, and then become brown and reddish. Before the completion of the life cycle, the cotton leaves have already fallen off, and the serious falling yellow area endangers the entire cotton field. This symptom is most likely to be misdiagnosed as acute Verticillium wilt, in fact, a phenomenon caused by potassium deficiency in cotton fields. Verticillium wilt appear in the flowering, the peak bell, usually in late July to August, the symptoms are cotton leaves