The behavior response of the parasitoid females (Diaeretiella rapae and Aphidius sp) and the aphidophagous predators (Hippodamia variegata, Coccinella undecimpunctata and Cheilomenes vicina isis (Crotch, 1874) in response to kairomone extracts of Aphis craccivora bodies in the three different solvents (ethyl alcohol, petroleum ether and acetone). The tested parasitoids and predators showed different in their response to kairomone extracts of the aphid, depending on the solvent used and the tested species. Both parasitoids and the predator, H. variegata exhibited positive response to kairomone extracts by using ethyl alcohol and petroleum ether in comparison with acetone. Acetone approved to be the best solvents to C.undecimpunctata, while ethyl alcohol extract elicited positive response to Che. vicina isis. Suggested that sensitivity of olfactory chemoreceptors differ according to solvent used and predator species. Volatile components in ethyl alcohol extract of A.craccivora were identified by gas chromatography/mass spectrometry (GC/MS). The main volatile components of A.craccivora extract are undecane, dodecane, tridecane, tetradecane, nonadecane, pentadecane, hexadecane, heneicosane, heptadecane, docosane and tricosane. Broad bean plants, attacked by A.craccivora release volatile chemical signals not only at the damaged site but from the entire plants, that attract the coccinellid predators (H. variegate,C. undecimpunctata and Che. vicina isis). Volatiles stimulated egg laying behavior by H. variegate.  The release of chemical volatiles was detected from upper, undamaged leaves after 3 days of continuous nympha1 feeding on lower leaves of the same plant. The released volatiles are: D-Limonene, 1,3,6-Octatriene,3,7-Dimethyl and 2-(1H-indol-3-yl) acetaldehyde. So, these allelochemicals could be used to manipulate natural enemies to enhance ovipositional behavior  on infested plants with aphid in the field.