First, the cause of the disease spread by the gray planthopper, especially before the five-leaf stage of the corn, the immunity is weak, if there are more gray planthoppers during this period, the most susceptible to disease.
Second, the symptoms first appeared in the fine veins on both sides of the midrib of the young leaves, and there were small points of transparent greening curve. Later, the transparent lines increased, and the waxy tears of different lengths appeared on the main veins of the leaves. The leaves of the diseased plants are thick green, the internodes are shortened, and the plants are dwarfed, often less than half of the healthy plants. The mild diseased tassel is poorly developed, with less loose powder and shorter ears. The number of filaments is small, the grain is reduced, and the roots of the diseased plants are few and short, which is less than half of the healthy plants. The plants of the seriously ill strains are dwarfed seriously, the leaves are compact and clustered, and the tassels are not extracted, and the ears are short and have no seeds.
Third, prevention and control measures 1. Planting disease-resistant varieties.
2. Seed coating or chemical dressing.
3. Remove the susceptible strains in time and take them out of the ground.
4. Remove the weeds in the fields and fields in time.
5. Add organic fertilizer, timely watering, and enhance the disease resistance of corn.
6. Adjust the corn sowing date. The wheat field interplanting is suitable for late sowing, preferably live broadcast, so that the corn seedling stage and the gray planthopper are staggered.
7. Chemical control. Before and after emergence, spray with 50% methamidophos 1000 times solution or 50% 1605 mixed with poison soil in the field. In the early stage of the disease, spraying the plant pathogen, the bacteria poison clear, and the gibberellin have certain effects of reducing the disease.
Second, the symptoms first appeared in the fine veins on both sides of the midrib of the young leaves, and there were small points of transparent greening curve. Later, the transparent lines increased, and the waxy tears of different lengths appeared on the main veins of the leaves. The leaves of the diseased plants are thick green, the internodes are shortened, and the plants are dwarfed, often less than half of the healthy plants. The mild diseased tassel is poorly developed, with less loose powder and shorter ears. The number of filaments is small, the grain is reduced, and the roots of the diseased plants are few and short, which is less than half of the healthy plants. The plants of the seriously ill strains are dwarfed seriously, the leaves are compact and clustered, and the tassels are not extracted, and the ears are short and have no seeds.
Third, prevention and control measures 1. Planting disease-resistant varieties.
2. Seed coating or chemical dressing.
3. Remove the susceptible strains in time and take them out of the ground.
4. Remove the weeds in the fields and fields in time.
5. Add organic fertilizer, timely watering, and enhance the disease resistance of corn.
6. Adjust the corn sowing date. The wheat field interplanting is suitable for late sowing, preferably live broadcast, so that the corn seedling stage and the gray planthopper are staggered.
7. Chemical control. Before and after emergence, spray with 50% methamidophos 1000 times solution or 50% 1605 mixed with poison soil in the field. In the early stage of the disease, spraying the plant pathogen, the bacteria poison clear, and the gibberellin have certain effects of reducing the disease.
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