This experiment  was carried out during summer 2014  to evaluate the efficacy of the three pesticides Ortus super; Abamectin and Challenger super and release of the predatory mite,  Neoseiulus californicus at three levels I :5,  I: I 0 and I :15  to control Tetranychus urticae Koch infesting soybean and cotton plants. Soybean experiment indicated that, the mean overall reduction percentages of the tetranychid mite were 51.2. 45.1. 39.8. 37.9 and 38.1 % for the three levels of predator release and Abamectin, and Challenger Super, respectively. These of cotton plants were 40.3, 32, 40.9, 44.3 and 46.3 %, respectively.  The highest increase percentage in soybean seeds was recorded fi.lr the predator. N. californicus at the release level of (1:15)  giving 55.8 %; also it  gave the highest increase percentage in  cotton tibers  recorded at the treatment of the predator, giving 45.3 %in comparison with control treatment. Thus, N. californicus successively reduced the population density of T. urticae on both soybean and cotton plants as compared with tested pesticides. Therefore, the release of N. californicus at 1: 10 level represents a useful management strategy for T. urticae.