Before mixing two pesticides, what must you check?

• A. The brand color and packaging design.
• B. The label for compatibility information and permitted mixtures.
• C. The expiration date only matters for packaging.
• D. The taste test you can perform.

Answer: (B)

Before mixing pesticides, you must check the label for compatibility information and which mixtures are permitted. The label is the authoritative source that says whether two products can be mixed, and if so, under what conditions (order of addition, adjuvants, water quality, rate, timing, and crop/pest restrictions). Following these guidelines helps prevent chemical reactions that can harm the crop, reduce control efficacy, or create safety hazards, and ensures you stay within legal use. If the label indicates the mix is allowed, you can sometimes confirm compatibility with a jar test using your actual water and any additives, but you should always rely on the label first. The other options don’t provide reliable guidance for safe or legal tank mixing—packaging appearance, expiration alone, or a taste test aren’t valid methods for determining compatibility.