棉花红叶枯病是一种非生物因素引起的生理性病害。1998年8月南疆阿克苏地区阴雨天气持续多天，导致红叶枯病普遍发生。叶片褪绿转变为红色，吐絮提前10－15天，铃重减轻，植株早衰，严重影响产量和棉花纤维品质。过去一些研究认为红叶枯病是由于缺钾所引起的，与肥料中缺钾有直 Cotton leaf blight is a physiological disease caused by non-biological factors. In August 1998, the rainy weather in Aksu Prefecture of southern Xinjiang lasted for many days, which led to the widespread occurrence of red leaf blight. Leaves chlorotic turn into red, boll floc 10-15 days in advance, boll weight reduction, plant premature aging, seriously affecting the yield and quality of cotton fiber. In the past a number of studies suggested that the red leaf blight is caused by potassium deficiency, and the potassium deficiency in the fertilizer is straight