It is always illegal to combine two or more pesticides in a spray tank unless there are specific mixing instructions on the labels of both products.

• A. True
• B. False
• C. Sometimes
• D. Only when mixing incompatible products

Answer: (B)

Mixing pesticides in a spray tank is regulated by label directions. You can tank-mix products only when each product’s label explicitly allows mixing with other products and provides the correct instructions for doing so. The statement is not always illegal because many products do authorize tank mixes; when both labels permit a mix and you follow the specified rates, order of addition, compatibility notes, and any required adjuvants, the practice is allowed. If a label forbids mixing or offers no mixing instructions for a product, you should not mix. Even when labels allow mixing, it’s important to verify compatibility with a jar test, ensure the mix is appropriate for the crop and pests, and follow all safety and regulatory requirements.