Cuticular extracts inducing aggregation in the XXXX , @entity13377 (L.).

@entity1044 @entity1042 @entity13377 @entity9436 @entity28579 @entity5681
German cockroaches @entity13377 (L.) are gregarious insects. An aggregation @entity5681 contributes to the maintenance of aggregates. Choice experiments checked the efficiency of different solvents, i.e. @entity1044 , @entity1042 and @entity28579 , in extracting attractive substances and compared the attractiveness of extracts of different parts of the body. @entity1044 and @entity28579 were the most efficient solvents tested for extracting the attractive substances. @entity1042 whole body extracts appeared inefficient to induce aggregation. The proportion of larvae attracted to conditioned papers decreased in relation to the size of cuticular surface washed, from whole body to half-body and again to a section of the body cut in three. Attractive substances appear to be present on all parts of the body. Chemical analysis by gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS) showed that the active extracts contained only cuticular @entity9436 . In addition to behavioural tests, differences between the composition of @entity1042 extracts and that of the extracts for the other two solvents were revealed by GC. These results indicated that the cuticular hydrocarbons operate as an aggregation pheromone in @entity13377 .
