Bemisia tabaci Genn. (Hemiptera: Aleyrodidae) and Tetranychus urticae Koch. (Acari: Tetranychidae) are major pests infesting string bean, Green beans Phaseolus vulgaris, in greenhouses. The use of different release regimes of the two predators;  Chrysoperla carnea (Steph.) (Neuroptera: Chrysopidae) and Amblyseius swirskii (Athias-Henriot) (Acari: phytoseiidae) was considered. The experimental desine included using either of A. swirskii or C. carnea solitary in sequential or combined release. Generally, the pests' populations decreased compaired with the control plants as result of predators release. The percent reduction of T. urticae and B. tabaci increased gradually to reach its maximum values (over 90 %) for T. urticae and B. tabaci, respectively  after 8 to 10 weeks of release over different release regimsThe present study indicated that the use of A. swirskii or C. carnea for controlling both T. urticae and B. tabaci on P. vulgaris reveled similar effeciency regardless they were used soliratily or in combination under green housae conditions. So using either of them as avilable natureal enemy can be recommended.