棉花红叶枯病是棉花中后期的主要病害之一,在主要棉区经常普遍或局部发生,遇上旱、涝年份,其危害程度超过其它棉病所造成的损失。 1996年,我省许多棉田发生红叶枯病较严重,棉株叶片从8月上旬开始变黄,叶肉组织褪绿,叶脉仍 Cotton leaf blight is one of the major diseases in the middle and later stages of cotton. It occurs frequently or locally in major cotton areas. In the event of drought and waterlogging years, the damage is more serious than other cotton diseases. In 1996, many leafy blight occurred in many cotton fields in our province. The leaves of cotton plants began to turn yellow from the beginning of August, and the leaf tissue became chlorotic.