If a jar test shows separation or precipitation, what is the recommended action?

• A. Proceed with the mix using a reduced rate.
• B. Do not tank-mix and re-check compatibility or modify ingredients as needed.
• C. Add more surfactants to fix the mixture.
• D. Store separately and apply later.

Answer: (B)

The key idea is that separation or precipitation in a jar test signals incompatibility among the components of the spray mix. When you see that, you should not proceed with applying the mixture as-is. Instead, stop and re-check compatibility using the product labels, compatibility charts, or extension guidelines, and adjust the formulation as needed to achieve a stable blend. This might mean changing the order of mixing, selecting different adjuvants or surfactants, altering water quality or pH, or substituting a compatible product. Adding more surfactants won’t fix the issue and can make it worse, and storing components separately to apply later defeats the purpose of a tank mix.