Predators can function to keep pest population outbreaks from occurring .
Parasites can function to reduce pest population outbreaks .
Insect behavior - observeable physiology . Behavior is a balance between internal physiology and environmental stimuli A. Host location host habitat location host plant recognition plant part recognition B. Reproductive behavior mate location mating frequency oviposition C. Host Location orientation and movement a. A substance emitted by an individual that elicits a specific reaction by other individuals of the same species. E.g., sex pheromone, aggregation pheromone, and others. I.e., they are NOT involved in primary metabolism.