In winter, the temperature is low, and most of the activities and hazards of pests and diseases are hidden and static. In the winter, when chemical pesticides are used, in addition to choosing pesticides on the road, we should also pay attention to the following six points. The first is to choose sunny days of high temperature medication. Because the pests have high temperatures in the winter, their food intake and respiratory intensity are greater than the cold and cloudy weather. Liquid medicines are sprayed on the worms, and more drugs are brought into the body, which is conducive to poisoning. The second is to increase the dose. The lethal dose of pesticides for pests is not constant. The lower the temperature at room temperature, the lower the lethal dose of insect pests, so it is necessary to appropriately increase the dosage in the winter, and it can prevent insects from eating and eating. Farmers' friends can determine the dosage according to the temperature, but it is generally not more than 50% of the conventional dosage. When applying pesticides in winter, water should be added strictly according to the dilution factor. Do not arbitrarily increase or decrease the amount of water. The third is the rational selection of pesticides suitable for winter use. In general, stomach poisons and contact poisons are less affected by temperature, and inhalants and fumigants are more affected by temperature. Such as the enemy killed, dichlorvos, dimethoate, methamidophos and other low temperatures will significantly affect the insecticidal effect. However, pesticides such as deltamethrin, phoxim, and lime sulfur can still exert better insecticidal effects when applied at lower temperatures. When herbicides are used during the cold season in winter, their display effect is much longer than that at high temperature. Therefore, it is necessary to wait patiently after the drugs are used. As long as the liquid is sprayed into place, it is generally not necessary to re-apply. Fourth, we must give priority to the use of soil pesticides. Soil pesticides have a low price. The disadvantage is that they are prone to phytotoxicity. However, the dormant period of fruit trees is resistant to pesticides. Controlling pests with pesticides such as Bordeaux mixture and lime sulfur is economical and effective. Fifth, we must extend the safety interval of crops. When pesticides are applied in winter, the degradation rate of pesticides will be slower, and the residual period of pesticides in crops will also be relatively prolonged. In winter, when pests and diseases of vegetable crops are to be controlled, special attention should be paid to prolonging the safety interval of pesticides and ensuring human health. Sixth, pay attention to the diluted drug solution. A small packet of 15 grams of "pharmacy primer" or "vegetable oil" or 10 grams of acidic "wash powder" can be added as an adhesive. However, it cannot be used when applying on vegetables.
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