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1. Choose a sunny day and take it at high temperature. The feeding rate and respiratory intensity of pests in the high temperature and high temperature period are obviously greater than the cold weather. At this time, there are many drugs absorbed by the insect body, which is beneficial to the effect of the drug.
2. Increase the dose appropriately. The pesticides in pests are not constant in lethal dose. The lower the temperature at normal temperature, the higher the lethal dose of pests. In winter, the dosage should be increased appropriately, but generally not more than 1.5 times the conventional dose. Strictly add water according to the dilution factor, and the concentration of the application cannot be changed arbitrarily.
3. Use pesticides that can be used at low temperatures. In general, stomach poisons and contact agents are less affected by temperature, and systemic and fumigants are greatly affected by temperature. If dichlorvos is used under low temperature conditions, the insecticidal effect is significantly reduced; and deltamethrin, stone sulphur mixture and other drugs can still exert better insecticidal effects under low temperature conditions. In addition, the use of herbicides in the low temperature period in winter, the effective time is longer than the high temperature season, wait patiently after the medication, as long as the liquid is sprayed in place, generally do not need to re-spray.
4. Extend the security interval. When pesticides are applied in winter, the degradation rate of the drug is slow, and the residual period in the crop is relatively prolonged. In order to ensure the quality and safety of agricultural products, we must pay attention to extend the safety interval.
5. The drug is fully dissolved and diluted. Add an adhesive to the pharmaceutical solution and mix well to dissolve the pesticide. Note that vegetable oil can not be added with vegetable oil or the like as an adhesive.
The winter temperature is low, and the following five points should be noted when applying pesticides to control pests and diseases.
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