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Response of German cockroaches to aggregation pheromone emitted by adult females

The response of early, middle and late instar (mixed sexes), adult male, and gravid and non‐gravid female German cockroaches to aggregation pheromone on filter papers conditioned by gravid and non‐gravid females was studied. Cockroaches were attracted to and settled on each of the conditioned papers. Classes varied in the strength of their response to conditioned papers, relative response to gravid versus non‐gravid female conditioned paper, and in clustering behavior. A significantly greater attraction of all classes except middle instars and non‐gravid females to paper conditioned by non‐gravid females suggests that non‐gravid females emit more aggregation pheromone than gravid females. Possible explanations of differences in response with age/sex class, including an enhanced attraction of males from female sex pheromone, are discussed.