Which of the following is a common framework for classifying pesticides?

• A. Pesticide formulation
• B. Types of pests
• C. Mode of action
• D. Pesticide chemistry

Answer: (C)

Grouping pesticides by mode of action means classifying them according to how their active ingredients affect pests at a physiological or biochemical level. This approach is central for resistance management, because rotating products that work through different mechanisms reduces the likelihood that pests will adapt and survive. In turfgrass pest management, mode of action is the standard framework used to organize products and plan rotations, so you can mix and match with lower crossing of resistance risk. Other ways of looking at pesticides—by how the product is formulated, by which pests they target, or by chemical family—don’t provide the same practical basis for rotating tools to manage resistance. That’s why mode of action is the best answer.