Trans-9-dodecen-1-ol is isolated from a variety of lepidopteran insects, such as the diamondback moth (Plutella xylostella) and the cotton bollworm (Helicoverpa armigera), as a key component of their sex pheromone. It is typically used in a blend with other pheromone components to create highly effective composite attractants. These attractants are used for precise monitoring and control of specific pest populations through trapping or mating disruption.