小麦白粉病的防治建水县园艺站６５４３００王雪蓉小麦白粉病发生初期叶片上出现白色霉点，逐渐扩大成圆形或椭圆形病斑，上面长出白粉状霉层，以后变成灰白色至淡褐色。后期在霉层中散生黑色小粒，病叶逐渐变黄褐色而枯死。此病除危害叶片外，还可危害叶鞘和茎秆，严重时... Prevention and control of wheat powdery mildew Jianshui County Horticultural Station 654300 Wang Xuerong White mildew appears on the leaves of wheat powdery mildew at first and gradually enlarges into a round or oval spot which grows white powdery mildew layer and then becomes grayish to pale brown. Later in the mold layer of black scattered loose particles, diseased leaves gradually brown and died. In addition to endanger the leaves of the disease, but also endanger leaf sheaths and stems, when severe ...