Watermelon Virus Disease
Question: The readers of Feifei Township said that the top of his watermelon pods has been found to have smaller leaves, followed by shrinkage and deformity, and the disease is small and thin. Ask what disease this is, how to prevent it?
Yan Jindong: According to the reader, his watermelon should have a viral disease. Watermelon virus disease is also called watermelon mosaic disease, toxin disease, and lobular disease. In recent years, the disease has a tendency of development, which is a common disease of watermelons. In severe years, the incidence of watermelon is drastically reduced; melon virus disease is mainly divided into mosaic mottled type and temporal lobe type. Mosaic plants grow weakly, with dark greenish-green or yellowish-green patterns on the top leaves. The leaves are uneven and the leaves are smaller, shrinking and deformed. When the disease is severe, the disease is thin, thin and thin, and the internode shortens. The result is small and small. The fruit is deformed and there is a greenish mottle on the fruit surface. The temporal lobe type is characterized by a narrow and long leaf, leaf margin curling and twisting. Plants grow slowly, dwarfing, apical tufts, poor flower development, and severe fruit set. The virus spreads through contact and transmission of poisons mainly through seed poisoning, aphid transmission, and agricultural operations such as pruning, crushing and pollination. In addition, high temperature, strong care and drought are conducive to the reproduction and migration of aphids, which are also conducive to the occurrence of diseases. When field locusts bloom, the risk of viral disease increases. Fertilizer-deficit plants are susceptible to disease.
Control methods
1. Agricultural control. Select disease-resistant varieties, melon and try not to be too close to the cotton and wheat and other crops to reduce the locust transmission opportunities. Seeds should be disinfected at the time of planting, strengthen field management and apply base fertilizer, lightly apply nitrogen fertilizer, increase phosphorus and potash fertilizer, and apply fertilizer to foliar surface during fruit set period. It is recommended to use vigor for agriculture or to spray a bucket of water with a king of foliar fertilizer. To enhance plant resistance to disease.
2. Chemical control. At the beginning of the onset, spray 2% of Ningnanmycin (Bacillus sp.) 300 times or 0.2% of Mushroom Proteoglycan (antiviral) 600 times or 20% of Moroxydine (Virus A) WP 500 times or 1.5% Plant disease spirit 1000 times liquid. Every 7 to 10 days spray again, continuous spray 2 to 3 times. At the same time as the medication, it is recommended to add high efficiency (silicone additives). Because of the increased frequency of drug use and increased drug resistance during these years, the addition of silicone builders can improve drug efficacy.
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