1. Choose Pesticides Suitable for Cold Weather Application
In general, stomach poisons and contact insecticides are less affected by low temperatures, while systemic and fumigant pesticides are more sensitive to temperature changes. For example, if you use certain insecticides like neem-based products or other biological agents, their effectiveness may decrease significantly in cold conditions. On the other hand, products such as sulfur-based mixtures or lime sulfur can still perform well even at lower temperatures. Additionally, herbicides applied during colder days often last longer compared to those used in hot seasons. Therefore, after spraying, it's important to be patient—once the liquid is properly applied, re-spraying is usually unnecessary.
Second, choose a sunny and warm day for pesticide application
During late winter and early spring, pests tend to be more active due to higher feeding rates and respiratory activity. This makes them more susceptible to the effects of pesticides. Spraying during warmer periods ensures that the chemical is absorbed more effectively into the pest's body, enhancing its overall efficacy.
Third, apply the correct dosage
In summer, using the standard recommended dosage usually results in effective pest control. However, in late spring and early spring, due to cooler temperatures, the performance of some pesticides may slow down. If the effect is not satisfactory, you can slightly increase the concentration, but it’s advisable not to exceed 50% above the standard dosage, depending on the temperature conditions.
Fourth, prioritize soil-applied pesticides
Soil treatments like Bordeaux mixture or sulfur-based products are cost-effective and efficient for controlling pests. However, it's important to avoid overuse, as they can cause phytotoxicity, especially on sensitive crops.
Fifth, pay attention to the safety interval of pesticides
During winter and early spring, the breakdown of pesticides slows down, leading to longer residual periods in crops. When applying pesticides to control crop pests and diseases, it's crucial to extend the safety interval to ensure the health and safety of consumers.
By following these guidelines, farmers and agricultural workers can optimize pesticide use in different weather conditions, ensuring both effectiveness and safety.
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