Due to the rainy season, high temperatures and humidity create ideal conditions for crop diseases and pest infestations. Spraying pesticides during or after rain can lead to dilution or washing away of the chemicals, reducing their effectiveness against pests and diseases. Additionally, this can cause water pollution and pose risks to humans and animals. According to **China Pesticide Network**, here are some effective strategies to manage pesticide application during rainy weather.
When choosing pesticides, opt for systemic options such as omethoate, carbofuran, 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 if it rains 6 hours later, they remain effective in controlling pests and diseases. For quick results, use contact insecticides like methamidophos, monocrotophos, and chlorpyrifos, which can kill pests within 1–2 hours. These fast-acting options help avoid the inefficiency of slower pesticides that may be washed away during rain.
Another useful approach is to use **rain-resistant pesticides** such as Jinggangmycin. These formulations can maintain their efficacy even 2–4 hours after rainfall. This makes them ideal for unpredictable weather conditions.
To further improve pesticide performance, consider adding **adhesives**—also known as wetting agents or spreaders—to the spray solution. These agents reduce surface tension, allowing the pesticide to adhere better to plant surfaces and insect bodies. This not only increases effectiveness but also minimizes loss due to wind or rain. Common adhesives include leather glue, soap, soybean powder, pulp waste liquid, Carbocin, polyvinyl alcohol, and synthetic detergents.
For example, when using synthetic detergent as an adhesive, mix it at a ratio of 1/1000 of the total solution weight. Dissolve it completely in water and then mix thoroughly before spraying. However, not all pesticides are compatible with adhesives. Acidic or slightly acidic pesticides should not be mixed with alkaline adhesives, as this can neutralize the active ingredients and reduce efficacy.
Some pesticides that can be safely mixed with detergents include "Hyperchloremone," "Acaricide," "Phosphos," and "Bordeol." On the other hand, certain pesticides like "Desenium," "Fumeishuang," "Detox," "Tubuzin," "dibromophosphorus," and "stone sulfur mixture" should not be combined with adhesives.
By selecting the right type of pesticide and using proper additives, farmers can ensure better protection for their crops, even during heavy rainfall. Always follow label instructions and take necessary precautions to safeguard both the environment and human health.
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