This study was carried out to determine the toxicity of four volatile oils of Wild mint (Mentha longifolia L.), Marjoram (Origanum majorana L.), Lemon peel (Citrus aurantiifolia Christm.), Orange peel (Citrus sinensis L.) and phospheine, against the adult of the Broad Bean Beetle Bruchidius incarnatus (Boh) (coleopteran: Bruchidae). The phosphine and marjoram oil were the most effective against B. incarnatus adults, 24h post treatment. Their LC50's were 0.0884 and 40.266 mg/l, resspectivley. In addition, the binary mixtures of wild mint with Marjoram volatile oils at all ratios 1:1, 1:2 and 2:1 exhibit potentiation effect. On the other hand, the binary mixtures of Lemon with Orange or Marjoram, showed antagonistic effect. The mixture of Wild mint with Lemon showed potentiation effect at the ratio of 2:1 and the same effect was recorded at the ratio of 1:1 in the mixture of Wild mint with Orange. The mixture of Wild mint with Lemon and Wiled mint /Orange showed antagonistic effect at the ratios of 1:1 and 1:2, respectively. But the mixture of Wild mint with Orange gave an additive effect at the ratio of 2:1, against adult of B. incarnatus, 24h post treatment. Concerning the binary mixtures of phosphine and the four volatile oils gave potentiation effect.