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玉米小斑病是华北夏玉米区主要病害之一。虽然通过选育和推广种植优良抗病品种有效地控制了此病的危害，但玉米是异花受粉作物，容易出现混杂退化，降低抗病性，同时玉米小斑病菌又是一个复杂的群体，所以有必要进行玉米小斑病菌生理小种的监测，及时掌握其变异动态与分布，为
Smaller spot maize is one of the main diseases in summer maize area of North China. Although the control of the disease by breeding and promoting the cultivation of excellent resistant varieties, but corn is cross-pollination crops prone to hybrid degeneration and reduce disease resistance, and Tubercles necrosum is a complex group, Therefore, it is necessary to carry out the monitoring of the physiological races of P. xylostella and to grasp the dynamic and distribution of the variation in time.