The key to unpolluted melons in greenhouses

Many diseases and pests of melon must be controlled. If it is not properly controlled, it will cause pollution and cause public hazards. In order to avoid the harm of melons to humans, in the production process of shed melons, we should grasp the following main prevention and control techniques. 1. Adhere to agricultural control mainly refers to changing crops. Wherever conditions permit, it is necessary to conduct paddy-up rotations to effectively suppress soil-borne diseases and pests; secondly, regular refueling can effectively prevent continuous disturbances; and thirdly, it is necessary to carry out winter irrigation and winter irrigation according to changes in the weather. Reduce the incidence of disease base. 2, there are three methods of disinfection disinfection, one is in the greenhouse for disinfection, can use sulfur smoke or chlorothalonil smoke agent, 667 square meters 200-250 grams, ignite closed smoke a day and night, can also be used Keling smoke agent, procymidone smoke agent, kill melon smoke agent and so on. The second is to use soil to eliminate soil. For every 100 square meters of greenhouse, use 40% carbendazim or 50% thiophantine 800 g, 100-200 liters of water, and 500-600 kg of fine soil. Spread it to the ground and mix it into the soil. The third is seed disinfection, one can use 55C warm soup soaking, two can be diluted with water diluted 40% to 2 hours with 40% formaldehyde diluted 150 times. 3, the use of low-toxicity pesticides were based on different diseases were selected 50% carbendazim, 70% chlorothalonil, 50% thioredoxin, 70% thiophanates, 95% dikesong, 50% sucrose, 20% Triadimefon and so on. Second, according to different insect pests, 50% of the total insect pests were used, 2.5% kung fu, 90% crystal trichlorfon, 20% insecticide water, 40% dimethoate emulsion, and 20% speed killing. Fungicides are generally diluted 600-800 times. The pyrethroid insecticide is diluted 2000-3000 times. Organic phosphorus pesticides diluted 1500-2000 times. The third is to promote the use of biological pesticides, such as high-efficiency Bt, Suave, Four Seasons Red, and granular body viruses. 4, the safe use of pesticides is to prevent the banned pesticides, such as methamidophos, omethoate, monocrotophos. Commonly used phoxim, carbaryl, or Ketete should not be used. The second is to strictly observe the pre-harvest interval, and it is generally stopped about 10 days before picking. The third is the occurrence of local diseases and insect pests and the control of local spotting. Fourth, a pest is generally applied only once. Do not increase the number at random and increase the concentration. China Agricultural Network Editor