There are three main methods for prevention and control of watermelon pests and diseases: agricultural control, biological measures, and chemical control. Common pests and diseases of watermelon include rickets, anthracnose, blight, blight, virus disease, fly, leafhopper, melon, and American plaque. Snorkeling and so on. Today, Xiaobian introduces you to the common pests and diseases of watermelon and how to prevent it. I. Agricultural control 1. Clean the countryside. First, the weeds along the ditch road near the melon field should be cleaned to reduce the host available in the early stage of the pest; second, the host of the watermelon mosaic virus is widely distributed, and the pest may be poisoned into the melon field after the pests endanger the weeds, and the impurities near the melon field are removed. Grass plays an important role in preventing pests and diseases; the third is to pay attention to clear the diseased plants of watermelon. The diseased plants should be removed and buried or burned, and should not be discarded in the ditch or on the side of the road. 2. Foliar topdressing. Melon farmers generally pay great attention to the application of base fertilizer, and foliar topdressing is also an important part of fertilizer application. When 0.2% potassium dihydrogen phosphate is combined with spraying pesticides, it can enhance the growth of the plant and improve the disease resistance. For plants with weak growth, it can increase the urea mixed spraying by 0.2%-0.3%. Foliar fertilization of the diseased watermelon plants can also play a role in slowing down the disease. Second, biological measures prevention 1. Use biological pesticide 2% Ningnanmycin 200-250 times solution, spray control before or before the onset of viral disease. 2. Aphids can be controlled by spraying with 0.9% worms 3000 times. Third, chemical prevention 1. After the emergence of watermelon, it is easy to cause catastrophic disease, spraying 66.5% Plex water agent 1000-1500 times liquid, or 64% anti-virus WP WP 400-500 times liquid, etc., can play an effective prevention and treatment. 2. For the control of Fusarium wilt, use 50% carbendazim WP 2 kg, mix 100 kg of fine soil, apply to the colonization hole, or use 50% carbendazim WP 500 times after planting, or 70% The methyl thiophanate 1000 times solution was irrigated once, 250 ml per hole, and the occurrence of anthrax was also prevented. In the early stage of wilt disease, after the wilt diseased plant was found, the circular pit with a depth of 8-10 cm and a radius of 10 cm was dug as the center of the diseased plant, so that the main root part was exposed, and 50% carbendazim WP 500 was used. Double solution or 70% methyl thiophanate 1000 times solution rooting, 500 ml per hole solution, can cure the blight. 3. Control of blight can be sprayed with 70% methyl thiophanate 800 times solution, or 64% anti-virus hydrazine powder 500 times solution. 4. Prevention and treatment of viral diseases The main disease is the spread of aphids and the prevention and treatment of viral diseases. It should be sprayed with 20% imidacloprid 1500 times before the peak of aphids. The protection site can be fumigation method, using 1.5% sputum smoke agent 300g per 667 square meters, evenly distributed in the shed, and the greenhouse will be sealed in the evening, ignited in turn, and the wind will be released after 12 hours in the closed shed; 80% dichlorvos can also be used. 667 square meters with 150-200 grams of fumigation, evenly distributed in the greenhouse, piled up a small pile of sawdust at each point, and then ignited down the dichlorvos fumigation, this method is generally carried out around noon during the day, when the temperature in the shed reaches 30 °C, smoked Ventilation after 2 hours. Virus plants were found to be sprayed with 20% virus A600 times solution and sprayed once every 7 days for 2-3 times. 5. Prevention and treatment of anthrax can be carried out in the early stage of the disease, spraying 80% of anthrax Fumex 800 times solution, or 70% methyl thiophanate WP 500 times solution, or 50% of the WP WP 400-600 times solution. The protective ground can be smoked and fumigated, with 45% chlorothalonil smoker per 200-250 grams per 667 square meters, and smoked once every 8-10 days, at the same time can cure the disease. 6. The leaf miner uses the larvae to sneak out the mesophyll in the leaves, forming many curved stalks in the leaves, mastering the adults to control the adults in time, or spraying the larvae when the stalks appear. It can be sprayed with 0.9% worms 3000 times solution, or 40% green broccoli 800 times solution, or 25% Aikas 1000 times solution, or 40% eucalyptus emulsifiable oil 1000 times solution. 7. Sterilization, insecticide and fertilizer mixed fungicides, insecticides and potassium dihydrogen phosphate for foliar application can not be mixed with anti-virus cockroaches, and other bactericidal and insecticides can be mixed. The general pesticide can be kept for about 7 days on sunny days, so the pesticide should be sprayed once every 7 days, so that the double effect of preventing pests and diseases and promoting the robust growth of watermelon plants can be achieved. The type of ball we can provide covers trunnion type ball, floating type ball, stem ball, three way type ball, special type ball etc. The ball size covers from 3 inch to 48 inch matching with pressure from class 150 to 2500lb. 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Comprehensive prevention and treatment method for watermelon pests and diseases