During the rainy season, crops are more vulnerable to pests and diseases due to the increased humidity and frequent rainfall. Applying pesticides during this period requires special attention to ensure effectiveness and minimize loss due to rain. Here are some key tips from **Chinese Pesticide Xiao Bian** to help you make the most of your pesticide use during the wet season.
First, it's important to choose **systemic pesticides** that can be absorbed by the plant’s leaves and stems and then transported throughout the plant. Examples include dimethoate, omethoate, monocrotophos, methamidophos, phosphonium, insecticidal mites, sedum, indigo, carbendazim, triadimefon, ethyl aluminum phosphate, tricyclazole, and powder azole. These types of pesticides are less affected by rain because they move into the plant tissue quickly and remain effective even after precipitation.
Additionally, some **contact or penetrating pesticides** like 1605, methyl 1605, trichlorfon, anti-carbocarb, quetiapine, chlorfenapyr, fenvalerate, green lactate, dexamethasone, and others are also suitable for rainy conditions. Although they don’t have systemic properties, they have strong penetration abilities and are resistant to being washed off by rain. According to the **Pesticide Network**, when applied to leaves, these pesticides can begin to show systemic effects within 2 hours. For example, phosphonamine can enter the plant within an hour, with about 50% of the dose entering the plant tissue in that time. Copper sprays and tricyclic azole sprays also maintain their efficacy without being significantly impacted by rain, even after 30 minutes and 1 hour respectively.
Another consideration is using **fast-acting pesticides** with strong knockdown power. These include phoxim, dichlorvos, omethoate, anti-aphid, Suwei, mixed weiwei, Methyl Demeton, Guangkewei, Xinweiwei, cotton boll, and extinguish Lingling, Xinguang No. 1, as well as pyrethroid-based products. These pesticides act quickly on pests, reducing the risk of them being washed away by rain.
Lastly, it’s beneficial to add **adhesives** to your pesticide mix to improve its ability to stick to plant surfaces. Common adhesives include soy flour, polyvinyl alcohol, and leather glue. This not only enhances the coverage but also improves the overall effectiveness of the treatment, especially in wet conditions.
By following these guidelines, you can optimize your pesticide application during the rainy season, ensuring better protection for your crops while minimizing waste and environmental impact.
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