What is the proper procedure for mixing pesticides and handling incompatible mixtures?

• A. Do not mix unless allowed by the label; always add water before concentrated product; keep containers clean; test compatibility if label permits.
• B. Use any order when mixing; easier.
• C. Add water after adding concentrated product; dry mixing only.
• D. Never test compatibility.

Answer: (A)

Mixing pesticides safely starts with following the label, testing compatibility when needed, and using a proper mixing sequence. The label tells you which products can be combined and how to use them together, so you should not mix unless the label allows it. If you’re making an approved tank mix, fill the spray tank with water first, then add the concentrated products while the tank is agitated. This dilution order helps achieve even distribution and avoids creating concentrated pockets that could harm the crop or reduce efficacy. Keeping all containers and equipment clean prevents residues and cross-contamination that could cause unpredictable results.

Before combining multiple products or adjuvants, test compatibility if the label permits it. A compatibility check helps you detect precipitation, separation, or excessive foaming before you mix a full batch, protecting the applicator, crop, and environment.

Choosing any other approach can ignore label directions, risk chemical reactions, or fail to catch incompatibilities, which is why this method is the best.