Corn roughage, commonly known as a slope, has been common in the early summer sowing of corn fields in our county in the past two years. Corn rough dwarf disease can develop in every growth period of corn, and is the most severely affected during seedling stage. Beginning at the base of the heart leaf and at both sides of the midrib, a transparent oil-immersed green dotted line is created, gradually spreading over the entire leaf. The diseased seedlings were dark green. The growth of the diseased plants was dwarfed and dwarfed. The leaves were broad and short stiff, the leaves were dark green, and the internodes were thick and short. The parietal lobes were clustered like Clivia. Leaf veins, leaf sheaths, and temporal lobes have waxy white sticks on the veins of the leaves, showing a noticeable roughness. From the 9th to the 10th leaf stage, the dwarfing phenomenon of the diseased plant was even more pronounced. The upper internodes were shortened and swollen, and the top leaves were clustered. The diseased plant height was less than half that of the healthy plant. Most of them fail to produce heading and fruit. Although some tassels can be extracted, they have very few branches and no pollen. Ears are misshapen, with few filaments, severe dwarfing of plants, degeneration of tassels, and abnormal ear formation.
Control methods
1. Select resistant varieties with relatively good resistance, and pay attention to reasonable layout to avoid large-scale cultivation of single resistant varieties.
2. Weed removal Roadside and field weeds are not only the provenance base of weeds in farmland in the coming year, but also the winter and summer hosts of the corn-dried media virus Laodelphax striatellus. Clearing weeds to a certain extent can reduce the damage of corn rough dwarf disease.
3, strengthen the field management combined with Dingmiao, remove field diseased plants, focus on deep buried or burned, reduce the source of invasive disease. Rational fertilization and watering, strengthening of field management, promotion of corn growth, shortening the period of disease, reducing the chance of transmission, and enhancing the resistance of corn to disease resistance.
4, spraying insecticide is a good seed before sowing. The use of systemic insecticides to coat and seed corn seeds can effectively control the planthopper stage and reduce the spread of the disease. The second is spraying pesticides. When the corn grows up to 2 leaves and 1 heart, it can be used to control diseased fields found by spraying insecticide + antiviral agent + foliar fertilizer. The insecticides have anti-indoles, fluconazole, imidacloprid, Acetamiprid, antiviral agents such as bactericidal agent, virus A, etc., foliar fertilizers such as potassium dihydrogen phosphate and Penshibao, were diluted in accordance with their respective dilution ratios, sprayed once every 7 days, and even sprayed 3 Times.
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