In winter, the temperature is low, and the activities and pests of pests and diseases are mostly in a hidden and static state. If the pesticide is not mastered, the control effect is often unsatisfactory. In order to improve the use of pesticides, in addition to selecting the right pesticides in production, the following points should be noted:
1, choose sunny days and high temperature medication
Because the pests in the winter when the temperature is high, the feeding and breathing intensity is greater than the cold weather, the liquid is sprayed onto the worm body, and the drugs are brought to the body more, which is beneficial to play the poisoning effect.
2, appropriate increase in medication
In the winter, if the dosage is applied according to the conventional dosage, the pests often cannot die after taking the medicine, so it is necessary to increase the dosage appropriately. The specifics should be based on the temperature, but generally do not exceed 50% of the regular dose. 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.
3. Reasonable 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. Such as enemy killing, dichlorvos and other pesticides, low temperature will significantly affect its insecticidal effect; and phoxim, stone sulfur mixture and other pesticides, can still play a better insecticidal and bactericidal effect at lower temperatures.
4. Priority use of soil pesticides
The price of soil pesticides is low, and the disadvantage is that it is easy to cause phytotoxicity. However, the fruit trees have strong resistance to pesticides during the dormant period in winter, and it is economical and effective to control pests with pesticides such as Bordeaux mixture and stone sulfur mixture.
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