白粉病该病危害植株地上部分,较成熟的部位先发病,初期在叶片表面出现白粉状斑点,以后逐渐扩大,互相融合,在茎、叶表面形成一层厚厚的白粉,严重时叶片退色,坏死枯萎。防治方法(1)农业防治。收获时,彻底收集病残物烧毁。(2)药剂防治。在发病初期,及时用15%粉锈宁可湿性粉剂1500～ Powdery mildew The disease endangered plant parts of the ground, the more mature parts of the first disease, the initial appearance of white powdery spots on the leaf surface, and then gradually expand, mutual integration, the stem and leaf surface to form a thick layer of white powder, severe leaf fade , Dead necrosis. Control methods (1) agricultural control. Harvest, the thorough collection of the disease burned. (2) Pharmacy control. In the early stages of the disease, 15% of the timely use of triadimefon WP 1500 ~