Near the end of the year, the weather is getting colder and colder. In winter, the temperature is low, and pesticides are applied differently this season. In the case of low temperatures, the activities and hazards of crop pests are mostly in a hidden and static state, and it is difficult to effectively control them. Let's take a look at the methods and techniques we should pay attention to when applying pesticides in winter.

First, rational selection of pesticides suitable for winter application. In general, stomach poisons and contact agents are less affected by temperature, and systemic and fumigants are more affected by temperature. Low temperature such as enemy killing and dichlorvos will obviously affect the insecticidal effect, while pesticides such as deltamethrin, phoxim and sulphur mixture can still exert better insecticidal effects when applied at lower temperature. Therefore, in winter to control crop pests and diseases, we must pay attention to the use of pesticides that are less affected by temperature. 2. Choose the medicine for sunny days and high temperature. Because when the temperature is high in winter, the range of activity and respiratory intensity of the pests increases, the amount of food intake increases, and the liquid is sprayed onto the worms, and the drugs are brought into the body, which is beneficial to the poisoning effect.

Second, appropriate extension of the security interval. In winter, the degradation rate of pesticides becomes slower, and the time of pesticide residues in crops is relatively long. When controlling pests and diseases of vegetable crops, it is necessary to appropriately extend the number of days (ie, the safety interval) of the last application of crops to ensure safe food.

Third, increase the amount of drugs appropriately. The pesticide lethal dose of pests is not constant. The lower the temperature at normal temperature, the lower the lethal dose of pests. Therefore, the appropriate dose increase in winter can prevent the insects from dying. However, it must not exceed a safe high concentration (ie, the maximum allowable dose of no phytotoxicity). When applying pesticides in winter, water should be added strictly according to the dilution factor. Do not increase or decrease the amount of water.

Fourth, improve the application method. In winter, the crop pests and diseases should be applied by smoke method or dust method. If spray application is used, the number of prevention and discharge and the amount of liquid spray should be appropriately reduced to prevent excessive humidity in the shed.

More pesticide knowledge , please pay attention to China Pesticide Network

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