It is commonly reported that some farmers have noticed that the effectiveness of disease and pest control during the rainy season is often unsatisfactory. This period is also a peak time for pests and diseases to occur. To ensure effective pesticide application, it's essential to understand and apply proper techniques. Here are key considerations to improve pesticide performance during the rainy season:
**Check the Weather Before Application**
The best time to spray pesticides is after the rain has stopped, rather than during or immediately before rainfall. Rain can wash away the chemicals, reducing their effectiveness. Always check the weather forecast and choose a dry window for spraying whenever possible.
**Select the Right Type of Pesticide**
During the rainy season, it’s advisable to use systemic, fast-acting, rain-resistant, and microbial-based pesticides for better results.
1. **Systemic Pesticides**
These pesticides are absorbed by the plant through roots, stems, and leaves, then transported throughout the plant. Examples include carbendazim, triadimefon, thiophanate-methyl, chlorpyrifos, and others. After application, 80% of the active ingredients are absorbed within 4–5 hours, reducing loss due to rain.
2. **Fast-Acting Pesticides**
Insecticides like dichlorvos, chlorpyrifos, and pyrethroids work quickly, killing pests within 1–5 hours. These are less affected by rain and provide good control even in wet conditions.
3. **Rain-Resistant Pesticides**
Some fungicides, such as Jinggangmycin, Tricyclazole, and Scopolamine, are resistant to washing away by rain. They remain effective even after heavy showers.
4. **Microbial Pesticides**
Pesticides like BT-781, *Beauveria bassiana*, and *Penicillium* thrive in high humidity. They are particularly effective during rainy periods when conditions are favorable for spore germination.
**Add an Adhesive to the Mixture**
To improve adhesion and prolong the effect of the pesticide on plants and pests, you can add a small amount of detergent or surfactant to the spray solution. For example, mixing 50–75 grams of washing powder into 50 liters of liquid and applying it immediately ensures better coverage and effectiveness.
**Spray with the Wind**
Always spray in the direction of the wind to avoid drift. This prevents the pesticide from being blown onto the ground or causing unintended exposure to people and animals.
By following these practices, farmers can significantly improve the effectiveness of their pesticide applications during the rainy season, ensuring better crop protection and higher yields.
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