If the label does not specify that two pesticides can be mixed, is it permissible to mix them?

• A. Yes, it is your responsibility to ensure they retain their properties.
• B. No, you must not mix unless the label explicitly allows.
• C. Only after performing a small-scale test on a small area.
• D. Only with explicit approval from the manufacturer.

Answer: (A)

Mixing pesticides is allowed only when the label or the manufacturer explicitly permits the tank mix. The label is the binding instruction for use, including whether combinations are allowed and how to mix them. If the label does not specify that two products can be mixed, you should not mix them because unlisted combinations can cause chemical incompatibilities, reduce efficacy, injure crops, or create safety hazards for workers. When you need a tank mix, look for explicit compatibility statements on the label or in the manufacturer’s published guidelines, and if there’s any doubt, do not mix until you have clear authorization or instructions.