What is indicated by clues such as heat, color change, gas, foam, or gel when mixing certain pesticides?

The presence of clues such as heat, color change, gas, foam, or gel when mixing certain pesticides is indicative of chemical incompatibility. These signs suggest that a chemical reaction is occurring between the substances being mixed, which can lead to reduced efficacy of the pesticide or even create hazardous byproducts.

Chemical incompatibility arises when the chemical properties of the pesticides interact unfavorably, resulting in reactions that can be detrimental to their intended function. For herbicide applicators, recognizing these signs is crucial for ensuring safety and effectiveness, as mixing incompatible chemicals can lead to unexpected behaviors that may harm the applicator, the environment, or the target plants.

In contrast, physical incompatibility typically involves issues like separation or sedimentation without altering the chemical properties or safety of the formulations. A jar test is a method used to evaluate compatibility before mixing larger quantities, whereas a band application refers to a specific method of applying pesticides to selective areas rather than the context of mixing them.