symptom:
In the early stage of disease, yellowish green and dark green mosaic spotted leaves appeared, and the leaves became smaller, the leaves were shrinking, uneven and curly. The main vine twists and atrophies, the plant dwarfs, the melons are small, the fruit surface has a thick and thin mottled, or a slight bulging bulge.
Causes:
Mosaic virus disease has a relatively high incidence in recent years. Its causes are: (1) Seed virus. (2) There are many weeds in and around the melon field, and diseases (mainly locusts) spread badly. (3) Under the conditions of high temperature and drought, strong sunshine, lack of water, lack of fertilizer, extensive management, and poor composting of organic fertilizers, they are all conducive to disease.
Prevention:
For melon virus disease, the following measures should be taken to prevent and treat: (1) Do seed treatment. Before sowing, seeds were soaked in hot water at 55°C for 40 minutes to kill the virus in the embryos. (2) Completely remove weeds. Clean up field and surrounding weeds early to prevent insect parasites. To keep away from the vegetable garden as far as possible. (3) Pay close attention to cultivation and management. Give full use of farmyard manure, increase phosphorus, potash fertilizer, supplement zinc fertilizer, boron fertilizer. Watering at seedling stage, diligently cultivating soil permeability. Watering topdressing timely after flowering to prevent premature aging and enhance plant resistance. When whole vines are grown, the healthy strains and the diseased strains need to be operated separately. Generally, the strains are first trimmed and then the diseased strains are rearranged to prevent the transmission of sap virus. With mulching, appropriate early sowing can reduce the incidence of disease. (4) Chemical control. Before the mites move, they can be sprayed with 10% imidacloprid 1000 times for prevention. In the seedling stage, the severely affected land can be used with virus A300 times 0.2% potassium permanganate plus 0.2% zinc sulfate or 300 times liquid virus K plus 0.2% potassium permanganate plus 0.01% copper sulfate or 300 times liquid leaflet enemy Plus Fengfeng No. 1 1000 times solution plus 0.2% ferrous sulfate for spray control. Spray once every 7 days, rotation, generally 1 to 3 times to control the condition. For the onset of individual plants, the above liquid can be used to irrigate the roots 1 to 2 times, 250 to 500 ml per plant.
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