MDARD Michigan Core Pesticide Applicator Practice Exam

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Prepare for the MDARD Michigan Core Pesticide Applicator Exam. Study with flashcards and detailed explanations for each topic. Get ready to excel in your examination!

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Which is NOT a common organophosphate insecticide?

  1. Chlorpyrifos

  2. Diazinon

  3. Malathion

  4. Propoxur

The correct answer is: Propoxur

Propoxur is not classified as a common organophosphate insecticide; instead, it is a carbamate insecticide. Organophosphates, which include Chlorpyrifos, Diazinon, and Malathion, function by inhibiting the enzyme acetylcholinesterase in pest species, leading to a buildup of the neurotransmitter acetylcholine and causing paralysis and death. Carbamate insecticides like Propoxur also inhibit acetylcholinesterase but have a different chemical structure and mode of action, distinguishing them from organophosphates. This distinction in chemical classification is what makes Propoxur the correct answer in this context.

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