What is the stress of applying pesticides in winter?

In winter, the temperature drops significantly, and the activity of crop pests and diseases tends to decrease, often entering a dormant or hidden state. However, this does not mean that pest and disease control can be neglected. In fact, proper management during this season is crucial for preventing outbreaks in the following growing seasons. When it comes to the prevention and control of crop pests and diseases in winter, several key points should be carefully considered: First, when choosing pesticides for winter use, it's important to select those that are less affected by low temperatures. Some chemicals may lose their effectiveness if applied in cold conditions, so opting for formulations that remain stable and active at lower temperatures is essential. Second, it's best to apply pesticides on sunny and warmer days. Although winter temperatures are generally low, there are still periods when the temperature rises slightly. During these times, pests become more active, increasing their feeding and respiration rates. This makes them more susceptible to pesticide exposure, as they ingest more of the chemical through food and water. Third, adjusting the dosage appropriately is necessary. The lethal dose required to kill pests can vary with temperature. At lower temperatures, pests may require a higher concentration of pesticide to be effectively controlled. However, it's important not to exceed the "safe high concentration" — the maximum amount that won't cause harm to the plants. Always follow the recommended dilution ratio when mixing pesticides and avoid altering the water amount. Fourth, improving application methods is also important. In winter, using smoke or dust methods can be more effective than spraying, especially in greenhouses. If spraying is necessary, reduce the number of applications and the volume of liquid used to prevent excessive humidity, which can promote fungal growth. Lastly, extending the safety interval between the last pesticide application and harvest is crucial. Winter slows down the degradation of pesticides, meaning residues may persist longer on crops. To ensure food safety, especially for vegetables, it's advisable to increase the number of days between the final treatment and harvesting. By taking these factors into account, farmers can better manage pest and disease issues during the colder months, ensuring both crop health and food safety. Science and technology information

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