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Which pesticides can be mixed?
Which pesticides can be mixed together, and which ones should not? In addition to selecting oral pesticides based on the target pest or disease, it's essential to understand their chemical properties. When mixing two or more pesticides, they must not cause any undesirable chemical or physical reactions. Before mixing, always check compatibility to avoid reduced effectiveness or even harm to plants.
Pesticides used in watermelon cultivation can generally be classified into three groups: acidic, neutral, and alkaline. Acidic pesticides include substances like copper sulfate and nicotine sulfate. Neutral pesticides consist of a wide range of organic compounds, plant-based pesticides, and microbial pesticides. Alkaline pesticides include products such as Bordeaux mixture, lime sulfur solution, and calcium ammonium nitrate.
When combining pesticides, neutral and acidic ones can usually be mixed without causing problems. For example, most organophosphorus insecticides and carbaryl can be safely mixed with each other. However, they should not be combined with alkaline substances like lime sulfur mixture, Bordeaux mixture, lime, soap, or detergents. These alkaline materials can react with certain pesticides, leading to precipitation or reduced efficacy.
Even though some pesticides may break down under alkaline conditions, the process is often slow enough that they can still be used alongside alkaline substances—provided they are applied together. If not, unwanted precipitates may form, preventing the formation of a protective layer on the plant and reducing the effectiveness of disease control.
It’s important to always follow the manufacturer’s instructions and conduct small-scale tests before large-area application. This ensures both safety and optimal performance of the pesticide mixtures. Understanding the compatibility of different pesticides is a crucial step in effective pest management.
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Which pesticides can be mixed?