Rainy day vegetable spraying should pay attention

To ensure effective pest control, it's important to choose fast-acting and systemic pesticides. For instance, insecticides like dicamba or deltamethrin can kill pests within 1 to 2 hours after application. These types of pesticides are particularly useful because they remain effective even if rain occurs shortly after spraying, as their impact on the target pests is quick and long-lasting. Systemic pesticides, such as carbendazim, are absorbed by the plant through roots, stems, and leaves, then transported throughout the plant. This means that even if it rains within a few hours, more than 60% of the active ingredients are already taken up by the crop, reducing the risk of wash-off and maintaining efficacy. In addition, when preparing pesticide solutions, adding an adhesive agent—such as dish soap or a mild detergent—can help the solution stick better to plant surfaces and reduce runoff caused by light rain. Some formulations also include diesel or kerosene-based emulsifiers, which improve the adherence of the pesticide to both plant foliage and pest bodies, increasing its overall effectiveness. It’s also crucial to monitor weather conditions before and after spraying. Try to apply pesticides just before or during light rain, but avoid spraying when heavy rain is expected. Ideally, there should be no significant rainfall for at least 8 hours after application, as this allows the pesticide to work properly without being washed away. By timing your spray correctly and using the right type of pesticide, you can maximize effectiveness while minimizing waste and environmental impact.

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