What is the term for substances that can enhance the adverse effects of pesticides?

The term for substances that can enhance the adverse effects of pesticides is "synergists." Synergists work by modifying the behavior of the pesticide in such a way that the overall toxicity or adverse effect is increased compared to the pesticide acting alone. This interaction can lead to heightened effectiveness or dangerous side effects, necessitating careful consideration in pesticide application to avoid unintended harm to non-target organisms or the environment.

In contrast, adjuvants typically aim to improve the efficacy of pesticides without necessarily increasing toxicity, while inhibitors and modifiers usually focus on altering chemical interactions in ways that don't enhance toxicity in the same manner as synergists. Understanding the role of synergists is crucial for safe and effective pesticide application, as they can significantly impact the risk profile of the pesticide's use.