Applying pesticides in the winter

The selection of drugs should be carried out in the winter to control crop pests and diseases, and attention should be paid 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.

The dosage should be applied to pesticides in winter. Under the guidance of professionals, the dosage should be increased appropriately, and the concentration of the liquid should be increased, but it should not exceed the “safe high concentration” (ie, the maximum allowable dose of no phytotoxicity).

When the timing is good, choose to apply the medicine during the high temperature and high temperature. Because the temperature is high, the range of activity and the breathing intensity of the pest increase, and the feeding amount increases. At this time, the application is beneficial to improve the control effect.

Methods It is necessary to prevent greenhouse crop pests and diseases in winter, 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.

The interval is long and the low temperature season, the degradation rate of pesticides is slow, and the residual time in the crops is relatively long. It is necessary to appropriately extend the number of days since the last application of the crops to ensure the safety of eating.

Author: Yutang Wang
Source: Agricultural Science and Technology News

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