First, the selection of drugs must be
In the winter, to control crop pests and diseases, it is necessary to pay attention to the use of pesticides that are less affected by temperature. In addition, when controlling pests and diseases in the dormant period of fruit trees, soil pesticides such as mineral oil emulsion, pine ester mixture and stone sulfur mixture are used, which is economical and effective.
Second, the amount of medicine should be large
In the winter, pesticides should be properly increased under the guidance of professionals to increase the concentration of the liquid, but not to exceed the "safe high concentration" (ie, the maximum allowable dose of no phytotoxicity).
Third, the timing is better
That is to choose to apply the medicine at high temperature during sunny days. Because the temperature is high, the range of activity and respiratory intensity of the pests increase, and the amount of food intake increases. At this time, the application of the medicine is beneficial to improve the control effect.
Fourth, the method must be appropriate
In the winter, we can control the pests and diseases of greenhouse crops, and apply the smoke method or dust method as much as possible. If the spray method is applied, the number of times of prevention and the amount of liquid spray should be appropriately reduced to prevent the humidity in the shed from being too high.
Fifth, the interval should be long
In the low temperature season, the degradation rate of pesticides is slow, and the time remaining in the crops is relatively long. It is necessary to appropriately extend the number of days from the last application of the crops to ensure safe consumption.
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