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Appropriate increase in the amount of pests of pesticides is not constant. Generally, the lower the temperature, the lower the lethal dose of pests. Therefore, the appropriate increase in the amount of drugs in winter can prevent the insects from dying.
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. And pesticides such as deltamethrin, phoxim, and stone sulphur mixture can still exert better insecticidal effects when applied at lower temperatures.
In the safe interval of extending crops, the degradation rate of pesticides in winter is slower, and the residual period of pesticides in crops is also relatively prolonged. When controlling pests and diseases of vegetable crops, attention should be paid to prolonging the safety interval of pesticides.
Note that a small packet of "medicine primer" or "vegetable oil" agent 15 g can be added as a sticking agent to the diluted solution of the drug solution. However, it cannot be used when applying medicine to vegetables.
Choose the medicine for sunny days and high temperature. Because the feeding temperature and respiratory intensity of the pests are greater than the cold weather when the temperature is high in winter, the liquid is sprayed onto the insect body, and the drugs are brought into the body, which is beneficial to the poisoning effect.
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