Volatile components present in lowbush blueberry and in other fruit from plants known to be hosts of Rhagoletis mendax were identified from 70 samples obtained in 2002 and 2003. The volatile components common to several fruit which can become infested by R. mendax may provide a chemical cue to the adults during changes in the local landscape. Components to be incorporated in synthetic mixes were selected based on the criteria of occurrence and the relative amount present in each fruit extract. The components may have potential both in the development of an attractive lure and also in understanding the potential range of R. mendax.