How to scientifically control corn rough disease
First, the characteristics of the disease. Maize rough disease is a viral disease transmitted by Laodelphax striatellus. It can be infected during the whole growth period, and it is the most serious damage in the seedling stage. The symptoms begin to appear when 5 to 6 leaves are present. The typical symptoms are severe dwarfing of the plants. The internodes are shortened and the leaves are densely clumped. The damaged leaves are darker, wider, shorter and harder than the normal leaves. The leaf veins of the leaves are uplifted, and the leaves are stiff, the heart leaves cannot be unfolded normally, and the diseased plants grow slowly and have a rough feeling. From the 9th to the 10th leaf stage, the dwarfing phenomenon of the diseased plant is more obvious. The height of the diseased plant is less than half of that of the healthy plant. Most of them cannot be sturdy and sturdy. Although some tassels can be extracted, there is no pollen. When it is serious, it cannot be sturdy. When the peak period of drug transmission coincides with the growth period of corn disease, it is easy to outbreak and cause devastating damage to corn production. Therefore, the prevention and treatment of the disease must not be ignored.
Second, prevention and treatment methods. The main focus of the prevention of maize rough virus disease is in the seedling stage. The main principle is to cut off the source of the disease and increase the disease resistance of the plant. It is necessary to adopt the principle of “selecting safe sowing period, supplementing the promotion of planting disease-resistant varieties, combined with the control of gray planthoppersâ€. Comprehensive control measures.
1. Plant disease-resistant varieties, and carry out seed dressing or seed coating. Through planting in recent years, it has been found that such varieties as Zhengdan 958 and Qidan 20 are more resistant to disease; at the same time, 40% methyl isoflavone can be used for seed dressing or coating at 0.2% of the seed amount. At the same time, add 2.5% of good music or 20% triadimefon (0.1% seed dressing according to the amount of seeds) and prevent corn black powder and other diseases.
2. Sowing at the right time. Appropriate late sowing of summer corn can be adopted, so that the susceptible period of corn is staggered from the peak of the poisoning of the gray planthopper. With the ripening of wheat, corn planting, the gray planthopper is transferred to the corn, and the early corn is planted. The hazard is the heaviest.
3. Strengthen field management. In the corn seedling stage, it is necessary to strengthen the field management, promote the early emergence of seedlings, and time seedlings, and find that the susceptible plants are removed early; and timely remove the weeds to reduce the source of the crude virus; at the same time timely watering, prevention and treatment of drought aggravate the occurrence of viral diseases.
4, chemical control. After the emergence of corn, the larvae can be controlled once and can be used to control the sphagnum sinensis with 10% imidacloprid 15-20 g spray. At the same time, antiviral agent virus A or Phytophthora No. 2 30-50 grams can be added, and 30 kg mixed spray with water can be used for prevention and control. 7-10 days, even spray 2-3 times.
5. Grasp the prevention and control of the source of transmission. Laodelphax striatellus is a source of transmission. In the 3-4 leaf stage of corn, it can be used to control the gray planthoppers in the field and around the plot. It can be used once every 3-5 days, and it can be sprayed on the weeds in the field, the ground and the ditch. The medicines include nitenpyram, ethreate, deltamethrin and the like. Remove weeds from the ground and destroy the environment in which the gray planthoppers lay their eggs. By adopting the above measures, it is possible to effectively prevent and cure corn rough disease and capture a bumper harvest of corn.
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