When may you mix pesticides with adjuvants or tank mixtures, and what should you check first?

• A. Always as labeled; mix adjuvants first, regardless of label.
• B. Never mix with adjuvants; always mix pesticides alone.
• C. Only as labeled; check label for compatibility, observe mixing order, and test compatibility with a jar test before full-scale mixing.
• D. Only after filling the tank; never test compatibility.

Answer: (D)

Mixing pesticides with adjuvants or in tank mixtures is allowed only when the label permits it, and you must verify compatibility before any large-scale mixing. The label will tell you whether adjuvants can be used, which products can be combined, and the required mixing order. If compatibility isn’t clearly stated, perform a jar test using the exact amounts and order you plan to use in the tank. Look for signs of incompatibility such as separation, layers, or gelling. If the jar test shows the mixture is compatible, you can proceed to mix in the spray tank strictly following the label instructions. Never assume compatibility or skip testing, and always follow the recommended mixing order on the label.