Are certain tank-mix mixtures prohibited?

• A. Yes
• B. No
• C. Not Sure
• D. Sometimes

Answer: (A)

Tank-mix decisions are governed by the product labels. Some mixes are prohibited because the label tells you not to combine those products in the same tank, or to apply them in a specific sequence. This is done to protect crop safety, worker safety, and the effectiveness of the products. Because the label is a legal directive, you cannot mix products that the label forbids in a single spray tank. Even when individual products seem compatible, there can be issues like phytotoxicity, reduced control, or chemical incompatibilities that the label addresses. If a tank mix is allowed, you still must follow compatibility testing and proper mixing order, and observe all rate, adjuvant, drift, and PPE requirements. When in doubt, don’t mix and seek guidance from the product label or the manufacturer.