红粉病分布与危害棉红粉病在各棉区都有发生,由粉红头孢菌引起,除危害棉花外,还危害苹果、梨、番茄、菜豆和水稻等。症状表现红粉病在铃壳和棉瓤上的霉层较厚,表现为粉红色松散的绒状物。天气潮湿时,霉层变成粉白色绒状物。红腐病的霉层较薄而紧密。红粉病病铃不能正常开裂吐絮 Powdery mildew distribution and harm Cotton powdery mildew occurs in all cotton areas, caused by the pink Cephalosporium, in addition to endangering cotton, but also endanger apples, pears, tomatoes, beans and rice. Symptoms Powdery mildew is milky on the shell and cotton stalk and appears as a pink, loose fleece. When the weather is wet, the mold becomes a white fluffy substance. Red rot mildew thin and close. Pink disease sick bell can not crack the mouth open normal floc