In winter, the low temperatures cause pests and diseases to become less active, often remaining in a dormant or hidden state. To ensure effective pest control during this season, **China Pesticide Network** offers some practical tips on how to apply pesticides more efficiently.
First, it's best to apply pesticides on sunny days when temperatures are relatively higher. During these times, pests are more active, with increased feeding and respiration rates. This makes them more susceptible to the pesticide’s effects once sprayed directly onto their bodies.
Second, consider adjusting the dosage appropriately. The lethal dose required for pests can vary with temperature. In colder conditions, pests may require a slightly higher concentration of pesticide to be effectively controlled. However, it’s important not to exceed 50% of the recommended dosage unless specifically advised. Always follow the dilution instructions carefully—never alter the water amount.
Third, choose the right type of pesticide for winter use. Systemic and fumigant pesticides are more sensitive to cold temperatures, while stomach poisons and contact agents tend to work better in lower temperatures. For example, insecticides like chlorpyrifos or diazinon may lose effectiveness in the cold, but products such as deltamethrin, phoxim, and sulfur-based mixtures remain effective even at lower temperatures. Similarly, herbicides may take longer to show results in winter, so patience is key after application.
Fourth, improve the spray solution by adding an adjuvant. A small amount of "medicine primer" or vegetable oil (about 15 grams) or a bit of acidic washing powder (around 10 grams) can help the pesticide stick better to plant surfaces. However, avoid using these additives when spraying vegetables.
Fifth, extend the safety interval between pesticide application and harvest. Winter slows down the breakdown of pesticides, leading to longer residual periods in crops. This means it’s crucial to observe the waiting period before harvesting to protect human health.
Lastly, prioritize soil treatments when possible. Soil-applied pesticides are often more cost-effective, though they carry a risk of phytotoxicity. However, during the dormant period in winter, fruit trees are more tolerant to pesticides, making products like Bordeaux mixture or sulfur-based sprays highly effective for pest control.
**China Pesticide Network** reminds everyone that increasing the dosage blindly is not advisable. Always adjust based on temperature and never exceed 50% of the standard recommendation. Proper application and careful planning will lead to better results and safer outcomes.
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