抄録
Preference tests were carried out in order to determine whether or not nymphs of Blattella germanica aggregate on filter papers conditioned with Periplaneta fuliginosa, P. japonica or P. americana, and those impregnated with methanol extracts of their own faeces. Results showed that nymphs of B. germanica aggregated on filter papers conditioned with not only the same species but also the other three species of Periplaneta cockroaches, although somewhat less effective. Methanol extract from faeces of B. germanica was effective on eliciting the aggregation response, and that from faeces of Periplaneta cockroaches was also effective but less in eliciting the response. It seems that the aggregation pheromone found in B. germanica is not strictly specific for its own species, but it has some common characteristic among Periplaneta cockroaches having aggregative nature.
