What is the definition of an aggregation pheromone?

An aggregation pheromone is a specific type of chemical signal used by insects to communicate with one another. These pheromones are released into the environment to attract other individuals of the same species, typically to encourage them to gather in a particular location. This behavior can be essential for various activities, such as finding food, mating, or enhancing protection against predators.

Unlike the other options, which refer to pesticides or toxicity methods, the definition highlights the role of pheromones as a means of intra-species communication, illustrating how insects interact with their environment and each other. The focus on chemical signals distinguishes aggregation pheromones from other concepts related to pest management.