Many farmers are unaware of which common pesticides can be safely mixed together and which should not. The author has summarized the key points as follows:
In addition to choosing the right pesticide based on the pest or disease being targeted, it's also important to understand the chemical properties of the products you're using. When mixing two or more pesticides, it’s crucial that they don’t undergo any harmful chemical or physical reactions. Only when this condition is met should they be combined.
Pesticides can generally be categorized into three types: acidic, neutral, and alkaline. Examples of acidic pesticides include copper sulfate and nicotine sulfate. Neutral pesticides consist of various organic compounds and microbial-based products. Alkaline pesticides include Bordeaux mixture, lime sulfur, and dexamethasone.
When mixing, neutral and acidic pesticides can usually be combined without causing any issues. However, most organophosphorus insecticides and carbaryl, such as dexanammonium, should not be mixed with alkaline pesticides like Bordeaux mixture or lime sulfur. They should also avoid contact with alkaline substances such as lime, soap, or detergents.
While some pesticides may break down in alkaline conditions, the process is often slow enough that they can still be used alongside these substances—provided they are mixed properly. If not, precipitation may occur, and the protective layer on the plant may fail to form, reducing the effectiveness of the treatment. Always check compatibility before mixing, and when in doubt, consult a professional or refer to the product label for guidance.
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