Figure 1

Ten-arm olfactometer used to test innate attraction to crop and banker plant pollen and prey homogenate in the predatory biological control agents Propylea japonica and Orius sauteri.
A = entrance; B = release chamber for predator; C = arm. Airflow in from the arms is created by an air pump placed under the release chamber. For each arm, odor source is located in the attractor chamber. The connection between the attractor and sampling chambers is depicted (lateral view) at the bottom.