Tips for applying vegetables in greenhouses

The winter temperature is low, and the activities and hazards of pests and diseases are mostly in a hidden and static state. The pesticide network suggests that the following points should be paid attention to when controlling vegetable pests and diseases:
1. Reasonably select 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 the winter to control 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.
3. Appropriate increase in dose. 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 the "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.
4. 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.
5. Properly extend the security interval. In winter, the degradation rate of pesticides becomes slower, and the time for bio-pesticides to remain in crops is relatively long. When controlling pests and diseases of vegetable crops, the number of days of last crop application (ie, safe interval) must be appropriately extended to ensure food safety. .

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