According to the law of occurrence of watermelon pests and diseases, due to the time, local conditions and reasonable operation of chemical control, it can be economic, safe and effective to control its harm, while also reducing the possible side effects to a minimum. I. Agricultural control Agricultural control is the use of comprehensive cultivation techniques to control, avoid or reduce the incidence of watermelon pests and diseases. At present, watermelons have entered the middle growth stage, and the main measures for agricultural control are: 1, clean pastoral current clean garden First, the roadside weeds near the melon field weeds as far as possible clean, reduce the host available before the pest, and melon fields after the application of chemical pesticides did not kill a pest less a hiding place; Second, as the watermelon mosaic virus host a wider range of insect pests may harm the weeds into the melon fields, so remove the weeds near the melon fields have an important role in the prevention of pests; the third is to remove the watermelon strains. The wilt disease and viral disease of watermelon cannot be cured once the infection has occurred. The diseased plants should be removed and buried deeply or burned. Do not dispose of the diseased plants in the ditch or on the roadside. This will artificially infect pathogens to other healthy watermelon plants, and the diseased plants will continue to be infected because the wilt disease bacteria can be found on the sick and dismembered bodies. Survived for 10 years. 2. Strengthen field management High temperature and high humidity are two important factors in the pathogenesis. The middle and late stages of watermelon growth are in high temperature and high humidity. Strengthening field management and controlling humidity are important measures to reduce the disease. The first is to dig well the “three ditch†(ie, the ditch, the Xianggou, and the ditch) so that the ditch and the ditch can communicate with each other, and the ditch can be dried up. The second is that a reasonable pruning pressure spreads the stems and leaves evenly, improves the ventilation and light transmission of the leaf layer, and enhances the photosynthetic efficiency and disease resistance. Third, when the rainy season ended prematurely at the end of the rainy season, care should be taken not to flood the area with irrigation. The irrigation volume can only account for two-thirds of the ditch depth. The length of irrigation time should be determined according to the nature of the soil. Sandy loam soils can be shorter in time, and clay time is slightly shorter. Longer, it is necessary to promptly eliminate water in the ditch after irrigation. The irrigation time is scheduled to take place in the evening when it is cool and the water is cool. Do not pour water at high temperatures. Second, chemical control When watermelons are eaten directly and they are consumed in large amounts, pesticides must be selected from the perspective of pollution-free pesticides. Scientific application of pesticides will not only save production costs, but also play a good role in pest control. 1. In addition to disinfectant, insecticides and chemical fertilizers mixed with fungicides, insecticides, and potassium dihydrogen phosphate for foliar application, they cannot be mixed with anti-virus crickets. Other bactericides and insecticides can be mixed and applied. General pesticides can be kept for about 7 days on a sunny day, so pesticides should be sprayed once every 7 days. This can prevent pests and diseases and promote the robust growth of watermelon plants. At the same time, we must constantly inspect the melon fields and find out the pests as soon as possible. It eliminates the point of initiation and the stage of filming, preventing the spread of spread, saving both the use of medicine and reducing pollution. 2, the right medicine to the disease first to find out the disease and insects, watermelon wilt disease do not need medication, only grafting is the most effective means of prevention and treatment of the disease. Foliar diseases such as epidemics and anthracnose can be formulated according to their degree of sensitivity. If the disease is lighter, it is generally controlled by single pesticides such as zein zinc, chlorothalonil, thiophanate-methyl, and anti-virus drugs. When the disease is severe, the use of zeslenium zinc + thiophanate-methyl, or zesin-zinc + chlorothalonil, or thiophanate-methyl + chlorothalonil can be used as a compounding agent. pesticide. Antivirus drugs must not be mixed with the above-mentioned several pesticides. Virus disease is the same as with wilt disease. No application is required, as long as the pruning is buried or burned. As long as the virus disease eliminates the locust, it blocks the media. Insect pests mainly include locusts, yellow-shouldered melons, and red spiders, etc., and are generally controlled by pesticides such as Le Siben, Kang Fu Duo, Kung Fu, Dichu, KeChongLing, and KeChongQuan. 3, to master the drug concentration is generally 65% ​​dexamethasone wettable powder 400-500 times, 75% chlorothalonil wettable powder 500 times, 50% thiophanate-methyl WP 600 times. 64% anti-drug WP 500 times. The preparation of pharmaceuticals is best to use scales, packaged into small packets, directly to the preparation of melon fields, the above drugs must be used interchangeably, resulting in resistance to bacteria, insecticide pesticides generally according to the instructions of the dose, especially new pesticides, not excessive Use, otherwise the insects did not kill and sneeze the leaves first. Insecticides should also be used in the same way as fungicides. Do not allow insects to develop resistance. 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