白粉病是葫芦科蔬菜的多发常见病。具有发病快，侵染迅速的特点，多发生在寄主生育的中后期，功能叶最易受其感染；一旦感染，防治起来极为困难，常给生产造成毁灭性危害。白粉病寄主范围很广，在黄瓜、南瓜、冬瓜、西瓜、甜瓜等均可寄生，也可在某些田间杂草上寄生，以闭囊壳 Powdery mildew is a common disease of cucurbits vegetables. It has the characteristics of quick onset and rapid infection. It occurs mostly in the middle and late stages of fertility. Functional leaves are the most susceptible to infection. Once infected, it is extremely difficult to control and often causes devastating harm to the production. Powdery mildew host a wide range of cucumber, pumpkin, melon, watermelon, melon, etc. can be parasitic, but also parasites in some field weeds to the capsule shell