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 the medicine for sunny days and high temperature. Because the pests are in the high temperature period in winter, the feeding amount and respiratory intensity are greater than the cold weather. The liquid is sprayed onto the insect body, and the drugs are brought to the body more, which is beneficial to the poison. Killing effect.
2, appropriate increase in the amount of drugs in the winter if the usual dosage, pesticides often do not die after taking medicine, so it is necessary to increase the amount of medication. 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, the priority use of soil pesticides and pesticides at low prices, the disadvantage is easy to produce 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 biological pesticides such as Bordeaux mixture and stone sulphur mixture.
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