Bracon cephi (Grahan) and B. lissogaster Muesebeck, are two specific parasitoids of the wheat stem sawfly that are under study to determine their efficacy against this pest. Plant-parasitoid interactions within the wheat-sawfly-parasitoid tritrophic system are investigated to determine the response of these parasitoids to chemical volatiles produced by wheat plants infested by wheat stem sawflies. Plant volatiles collected from infested wheat plants under controlled greenhouse conditions, were injected into a Gas Chromatography – Electroantennogram Detection (GC-EAD) system and analyzed. A sensory response by the parasitoids to some of the compounds present in the volatile blend provides valuable information about which of these compounds are detected by the parasitoids. The next step in this study is to determine the behavioral response of the parasitoids to each of the compounds that generated sensory activity, which will establish the importance of each compound to the parasitoids. The results obtained from these experiments might provide an effective tool in the control of the wheat stem sawfly. Using specific chemical compounds as attractants (kairomones) of parasitoids might increase the level of control of the sawflies in the field.