Corn rough stem disease, also known as corn stripe atrophy, is a fatal disease in corn. The disease is a viral disease transmitted by the planthopper. The harm caused by rough stem disease in corn exceeds any other disease in corn and seriously affects the yield and quality of corn. At present, the disease has already occurred in some of our provinces. A field survey found that the incidence of the disease is generally 10 to 20%, and the incidence of severe land mass can be as high as 33%. At present, for this disease, there are no specific prevention and treatment drugs in China. The timely use of drugs can effectively inhibit the spread of the disease, delay the disease and reduce the disease. First, the symptoms Symptoms of corn rough stem disease stems from the use of Laodelphax cornuta herb juice, the virus will be infected corn plants, so that corn plants susceptible. The main symptoms are: corn plants have twisted growth, some corn plants are dwarfed, and internode shortening is clustered; leaf color is dark green, leaves are thick and short and wide, brittle and hard, densely clustered; back veins produce thickness Varying waxy white bars with a touch of hand have a noticeable rough feeling and the dwarfing of plants is serious. The disease, such as infection in the 4 to 5 leaf stage of maize, is a severely ill strain and generally cannot be eared, resulting in an outbreak. The seven leaf stages of the maize were susceptible to disease, and the plants were capable of heading and fruiting, but the tassels were stunted, the pollen was less, the ears were short and small, and the spikes were small, and the spikes were small and deformed. The yield was generally more than 50%. Second, prevention and control measures 1, in the winter and spring to fly out of earthworms to clear the weeds in the fields, eliminate the planting sites of the winter planthoppers and completely eliminate the planthoppers. 2. Appropriate early sowing, adjust the corn sowing period, so that the maize seedlings avoid the migration of Smilax falciparum. 3, in order to prevent the occurrence of corn stem shortening stem disease, corn seeds should be treated with pellets before corn sowing, corn seeds treated by pills, the surface of the seeds have bactericidal, insecticidal effect, can effectively prevent the pests and diseases. 4. Seed dressing of corn seeds before sowing, use 0.2% to 0.3% of the seed of the corn for seed dressing, use 15% of the seed amount, or use 75% of “3911†EC for seed dressing. The dosage is 0.3% of the seed amount. 5, seedling spray control. In the 4-leaf stage of maize emergence, 40% aqueous chloridophos emulsion can be sprayed at 450-750 ml/ha. In the 5 to 7 leaves of corn, it can be used to mix and spray plant growth regulators such as Phytophthora infestans and Fuerke Bacteria 600 times liquid plus Fuer Victor to effectively alleviate the disease and cure the diseased plants. However, the key spraying control period should be on the corn 4 to 5 leaf stage. 6. Once the maize seedling stage is infected with corn rough stem disease, measures should be actively taken to control spraying. The phytohormones, such as fulguroxan, virus A, gibberellin, and diterpene, all have a certain inhibitory effect on corn rough stem disease. Under normal circumstances, more toxic pesticides have good control effect on corn rough stem disease.