Pesticide Types And Formulations MEDIUM 40 CFR § 156.10 & Core Manual Chapter 8

When an applicator intends to tank-mix two pesticides that do not explicitly mention physical compatibility on their labels, what is the standard EPA-recommended procedure?

Multiple Choice Options

A Perform a small-scale 'jar test' using proportionate amounts of carrier and products in the correct mixing order (WALES/DALE rule) to check for precipitation, clumping, or separation. ✓ OFFICIAL VERIFIED CORRECT ANSWER
B Fill the 500-gallon field spray rig to capacity and observe the pump pressure gauge for fluctuating vibration.
C Add a household dishwashing detergent to guarantee chemical bonding.
D Heat the mixture in an open metal container over a propane flame to evaluate boil-off.
✓ LEGAL EXPLANATION & STATUTORY RATIONALE
40 CFR § 156.10 & Core Manual Chapter 8
Official Manual Chapter: Chapter 8: Pesticide Formulations

A physical compatibility jar test using proportionate quantities of water, carrier, and chemicals in a clean 1-quart glass jar allows the applicator to verify whether the products remain smoothly mixed or form precipitates, layers, sludges, or curds before mixing large, expensive tank loads.

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