玉米圆斑病是吉单101玉米自交系吉63极易发生的一种毁灭性病害。为了防治此病害,我们在平房乡用25％粉锈宁涂穗进行防治玉米圆斑病试验。结果,防治田平均发病率为7.82％,对照田平均发病率为33.86％,防效为76.9％。全乡推广应用4700亩,每亩地挽回损失50—52公斤。每亩地用药成本为0.49元。具体作法:7月下旬,玉米刚出穗吐丝,玉米下部叶鞘上刚发生水浸状圆形病斑时,每亩用25％粉锈宁10克加水1—2公斤,配成100—200倍 Corn spot is a devastating disease that is extremely susceptible to Ji63 maize inbred line Ji63. In order to prevent this disease, we use 25% powdery mildew coated spike in bungalow to control corn circular spot disease. As a result, the average incidence of control field was 7.82%, the average incidence of control field was 33.86%, and the control effect was 76.9%. The township to promote the use of 4700 acres, 50-52 kilograms of damage per acre to restore. Medication cost per acre was 0.49 yuan. Specific practices: late July, corn sprouts just emerging, the lower part of the corn leaf sheath just flooded like a circular spot, with 25% per acre powder Ning Ning 10 grams of water 1-2 kg, dubbed 100-200 times