The best way to spray pesticides in the cold season
1. Reasonable use of pesticides
Some pesticides are greatly influenced by temperature, their efficacy decreases with decreasing temperature, while some pesticides are less affected by temperature, even at lower temperatures (below 15°C), they can exert their normal insecticidal action. Like cypermethrin, the toxicity of this insecticide at low temperatures (15°C) is higher than at high temperatures (25°C). Therefore, in winter and spring cold seasons to prevent crop pests and diseases, we must pay attention to pesticides that are less affected by temperature.
2. Appropriately increase the dosage
When pesticides are sprayed in the low temperature season, the dosage should be appropriately increased and the concentration of the liquid medicine should be increased under the guidance of a professional, but it must not exceed the “safety high concentration†(that is, the maximum allowable drug dose without phytotoxicity).
3. Choose to spray on sunny days at high temperature
When the temperature is high, the range of activity and respiratory intensity of pests increase, and the amount of food intake increases. At this time, the spraying of pesticides will improve the control effect.
4. Improve application methods
Prevention and control of greenhouse diseases and pests in winter, as far as possible by the smoke or dust method; if the spray method of spraying, to reduce the number of control and the amount of liquid spray, to prevent excessive humidity inside the shed.
5. Properly extend the safety interval
In the cold season, the degradation rate of pesticides is slow, and the time left in the crops is relatively long. It is necessary to appropriately extend the number of days from the last application of crops to harvesting (ie, the safe interval) to ensure food safety.
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