Due to the rainy season, high temperatures and humidity create ideal conditions for the spread of crop diseases and pests. Spraying pesticides during or after rain can lead to chemical dilution or washing away, reducing their effectiveness against pests and diseases. Additionally, runoff from rain can pollute water sources and pose risks to humans and animals. According to **China Pesticide Network**, here are some effective strategies to improve pesticide performance in wet weather.
Opt for systemic pesticides such as omethoate, carbofuran, and monocrotophos, along with fungicides like carbendazim, thiophanate-methyl, and tricyclazole. These products have a high active ingredient content (over 60%) and are absorbed by crops within 4–6 hours. Even after rain, they remain effective for up to 6 hours, ensuring continued protection against pests and diseases. For faster action, use contact insecticides like methamidophos, monocrotophos, and chlorpyrifos, which kill insects within 1–2 hours. These quick-acting options help avoid the inefficiency of slower pesticides during rainy periods.
Another useful option is **rain-resistant** pesticides like Jinggangmycin. These formulations remain effective even 2–4 hours after rainfall, making them ideal for wet conditions. To further enhance pesticide adherence, consider adding **wetting agents or spreading agents** to the spray solution. These additives reduce surface tension, allowing the liquid to spread more evenly on plant surfaces and insect bodies. This not only improves coverage but also reduces losses caused by wind and rain.
Common wetting agents include leather glue, soap, soybean powder, pulp waste liquid, Carbocin, polyvinyl alcohol, and synthetic detergents. When using a synthetic detergent, mix it at a ratio of 1:1000 (by weight) into the pesticide solution. Stir well before application. However, not all pesticides can be mixed with adhesives. Acidic or slightly acidic formulations should avoid adding alkaline wetting agents, as this may neutralize the active ingredients and reduce effectiveness.
Pesticides that can safely be combined with detergents include "Hyperchloremone," "Acaricide," "Phosphos," and "Bordeol." On the other hand, certain products like "Desenium," "Fumeishuang," "Detox," "Tubuzin," "dibromophosphorus," and "stone sulfur mixture" should not be mixed with adhesives.
By choosing the right pesticides and enhancing their performance with proper additives, farmers can maintain effective pest and disease control even during heavy rains. Always follow label instructions and safety precautions when handling chemicals.
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