Which action is considered a legal deviation from pesticide label directions?

The correct choice indicates a legal deviation from pesticide label directions that is specific to mixing practices. In this context, when an applicator mixes two pesticides that are not specified as compatible according to the label, it represents a deviation because the label provides specific guidelines on how and with what substances a pesticide can be mixed. These guidelines are formulated to ensure efficacy and safety, both for the applicator and the environment.

In contrast, applying a pesticide only for targets specified on the label aligns with the requirements of proper application and is therefore not a deviation. Similarly, applying a pesticide at a higher concentration than directed or using prohibited application methods represent serious violations of legal guidelines and can lead to various regulatory consequences. Therefore, the mixing of incompatible pesticides is highlighted as the example of a legal deviation due to its emphasis on mixing standards that must be adhered to for safe and effective pesticide use.