Apply pesticides in a timely manner

First, timely medication is the key to rational drug use. 1. According to the different characteristics of the pest growth period, timely use of drugs. With the increase of the age of the insects, the resistance of vegetable pests has also increased. The best period of application of pesticides and pesticides should be before the 3rd instar larvae; for drillworms, such as cotton bollworm, carnivorous insect, sphagnum, scallions and other pests, the appropriate period of application should be at the peak of hatching; adult stage It can be induced by sexual attractants, and the effect is obvious. 2. Choose the best medication period according to different climates. The control effect of many pesticides is closely related to the temperature, such as trichlorfon, dimethoate, phoxim, etc., and its control effect increases with temperature in a certain temperature range. Therefore, such pesticides are higher in temperature. Take medication at high time. Pyrethroid insecticides such as kung fu, bifenthrin, bifenthrin, cyfluthrin, etc., have better control at lower temperatures, so such pesticides should be used in the morning and evening. Insecticides, fungicides, herbicides and growth regulators with systemic transport function, when the field is weak, the temperature is low, and the relative humidity of the air begins to rise, the agent volatilizes less, and most of it can be absorbed by plants. Good control, so these medicines should be used in the afternoon or evening. Microbial pesticides are sensitive to light and humidity, and should be used when foggy or dew is more. 3. Select the best period of drug use according to the characteristics of different infestation hazards of vegetable diseases. Drug control should be carried out before the most serious disease hazard and heavy loss of production. When applying a protective fungicide, the drug should be applied before the infection of the crop. 4. Choose the best time according to the effect of cultivation management after administration. In the winter greenhouse production, in order to maintain the temperature of the greenhouse and reduce the humidity of the air, it should be used in the morning or at noon on sunny days, and it is convenient to release air and drain after work. Cultivation of open vegetables, avoiding the use of drugs before rain to prevent rain from diluting the liquid.

Second, appropriate medicine. At present, pesticides produced in China or imported from abroad are mainly based on emulsifiable concentrates; fungicides and herbicides are mainly wettable powders. Therefore, the current application of pesticides in China is mainly spray, followed by shaking, dusting, dusting, and poisoning. Different application methods can be selected according to different situations. 1. Control underground pests. Prevention and control of underground pests can be carried out by means of shaking, bait, poisonous soil, root irrigation and soil treatment. 2, to prevent seed bacteria. The seeds can be treated with chemicals, soaked in warm soup, and the like. 3. Use medicine in the production of protected areas. Currently commonly used methods of application are spraying and igniting aerosols.

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