What is the term used for the ingredient in a pesticide formulation that actively controls the pest?

The term for the ingredient in a pesticide formulation that actively controls the pest is "active ingredient." Active ingredients are the chemicals that provide the desired effect of pest control; they are responsible for the toxicity or effectiveness against the target pest. Understanding this term is crucial for anyone working with pesticides, as it directly relates to their function and efficacy.

The other terms mentioned refer to different components of pesticide formulations. Inert ingredients are substances that do not contribute to the pesticidal effect but may serve as solvents, stabilizers, or agents to enhance the application or effectiveness of the active ingredients. Carrier substances are typically inert and help in delivering the active ingredient to the target site. Adjuvants are additives that modify the behavior of a pesticide to improve its performance, such as enhancing spread or adherence to surfaces. Recognizing these distinctions helps in understanding how pesticide products work and how to use them effectively.