(1) There is a faded dotted line between the venules on both sides of the midvein of symptomatic young leaves. With the increase of dotted lines, wax-like tears of different lengths appeared on the main veins of the back of leaves, the leaves became wider and thicker, the leaves were dark green, the internodes became shorter, the plants were dwarfed and the height was halved. In severe cases, it does not tassel or pollinate, the female ear is deformed or the seeds are reduced, and the roots are few and short, which is not as good as healthy plants. Some diseased plants have curly leaves, bow-shaped tender leaves or oxtail-shaped leaves, notched heart leaves, flared mouth facing one side, and red leaf edges. (2) The infection route and transmission law of maize rough dwarf virus through Laodelphax striatellus. In the northern corn region, rough dwarf virus can overwinter in winter wheat, perennial gramineous weeds and Laodelphax striatellus, and all the corn and weeds harmed by Laodelphax striatellus are the source of the virus. In North China, the susceptible period is from early May to the middle and late June, which coincides with the peak of overwintering adults and first generation nymphs of Laodelphax striatellus. (3) Selecting disease-resistant varieties as control methods, and sowing dates are basically the same; Improve the farming system and reduce the area of interplanting corn in wheat fields in seriously ill areas; Weeds in the field should be removed in winter and spring, before and after corn sowing, and the wintering and breeding places of virus-borne Laodelphax striatellus should be removed; Adjust sowing date to avoid the peak period of Laodelphax striatellus migration in maize seedling stage; Rational fertilization and watering, increased application of organic fertilizer, phosphorus and potassium fertilizer, promote the robust growth of corn, shorten the seedling stage and reduce the chance of virus transmission; Coat with seed coating agent.