What term describes the mechanism by which a pesticide controls its target organism?

The term that describes the mechanism by which a pesticide controls its target organism is "mode of action." This refers to the specific biochemical interaction through which a pesticide exerts its effect on pests. Understanding the mode of action is crucial for selecting the appropriate pesticide for a given pest problem, as it helps applicators anticipate the efficacy of the product, the potential for resistance development, and the environmental impact. The mode of action determines how the pesticide affects the biological processes within the target organism, leading to its control or elimination.

The other options refer to different aspects of pesticide use. "Mode of application" pertains to the method employed to apply the pesticide, such as spraying, granulating, or drenching. "Control method" can describe a broader strategy for pest management that may involve multiple tactics, including cultural, mechanical, and chemical approaches. "Application technique" refers to the specific means by which a pesticide is delivered or dispersed in the environment. Each of these terms addresses a different facet of pest management, thus not directly defining the mechanism of action within the target organism itself.