Influences of certain insecticides, i.e. abamectin, Primiphos methyl Bemistop, Trigard and pyriproxyfen versus releasing the ectoparasitoid, Diglyphus isaea were evaluated to estimate their effectiveness for controlling the leaf miner liriomyza trifolii (Burgess) infesting Phaseolus vulgaris grown under field and glass house conditions. Results indicated that all treatments caused increased in the tested pest's and Diglyphus isaea populations in both applications. Highest reduction values in L. trifolii population occurred after 1 and 2 applications of Trigard (87.2 & 81.0%) followed by Actellic (68.6 &75.8%), V st nd ertimec (67.5 &75.3 %) and Admiral (60.5 & 66.2 %). While the low effect was shown after treatment by Bemistop (54.9 &57.1 %). In case of releasing Diglyphus isaea in the green house, data showed that in order to obtain satisfactory control of Phaseolus vulgaris, weekly releases of the parasitoid are needed and that the rates of 4/30 and 2/30 (parasite / larvae) proved as best rates for release. Therefore, D. isaea can be considered a good promised control element especially in successful release of some IPM programs of Phaseolus vulgaris grown under glass