Experiment was conducted in a greenhouse to study the effect of two compost rice straw and farmyard manure against the spider mite, Tetranychus urticae (Koch)  by three different methods of application spray, (spray+ added) and added to soil. Data showed that the highest  reduction percentages of T. urticae was obtained by (R.W) spray the plant and added to soil (87.46%), while (Fym) spray and (Fym)spray and added to soil were equal in the reduction mortality which were 83.7% and 82.4%, respectively. The lowest reduction was achieved by (R.W) added to soil( 63.46%) .  All treatments had significant differences in reducing T. urticae populations infesting on pepper between treatments and check after spraying.