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Second, appropriate increase in the amount of medication. In the winter, if the dosage is applied according to the conventional dosage, the pests often do not die after taking the medicine, so it is necessary to increase the dosage appropriately. The specific dosage should be determined according to the temperature, but generally does not exceed 50% of the conventional dosage. When applying pesticides in winter, water should be added strictly according to the dilution factor. The amount of water should not be increased or decreased at will.
Third, reasonable selection of pesticides suitable for winter application. In general, stomach poisons and contact agents are more affected by temperature. Such as enemy killing, dichlorvos, dimethoate and other pesticides, low temperature will significantly affect its insecticidal effect; and deltamethrin, phoxim, stone sulfur mixture and other pesticides, can still play a better kill at lower temperatures Insect effect. In addition, the herbicide is applied in winter, which shows a much longer effect than after the summer application. After the medication, it is necessary to wait patiently, and generally does not need to re-spray.
Fourth, the priority use of soil pesticides. The advantage of soil pesticides is that they are inexpensive and have the disadvantage of being susceptible to phytotoxicity. However, the fruit trees are resistant to pesticides during the dormant period in winter, and it is economical and effective to control pests with soil pesticides such as Bordeaux mixture and stone sulfur mixture.
5. Pay attention to extending the safety interval of pesticides. When pesticides are applied in winter, the degradation rate of pesticides becomes slower, and the residual period of pesticides in crops is also relatively prolonged. When controlling pests and diseases of vegetable crops in winter, special attention should be paid to prolonging the safety interval of pesticides to ensure safety.
Huaxian County Agricultural Products Inspection and Testing Center Chang Bili
Winter application techniques
First, choose a sunny day and high temperature time medication. Because the pests have higher feed intake and respiratory intensity when the temperature is higher, the drug is sprayed onto the worm and more drugs are brought into the body, which is beneficial to play a poisonous killing effect.
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