Three trade mineral oils B. W and Y were formulated as emulsifable concentrates in percentages of 94, 95 and 85, respectively.  The physical properties of the mineral oils used indicated that, Y 85% EC mineral oil was the best one because it was more viscous, acidic and, its density and specific gravity were more than the other mineral oils.  Also, the spray solutions of Y (85% EC) mineral oil for soft and hard waters were more effective than the other spray solutions of B 94%  and W 95% EC mineral oils. The three mineral oils were evaluated against the adults of Aphis fabae and Tetranychus urticae under laboratory conditions, comparing with Kz oil “mineral oil" as control oil.  The results indicate that the Y 85% EC exhibited that highest levels of relative toxicity (94.26) fold against A. fabae.  The results of the tested mineral oil against the T. urticae showed very low level of R.T. Y 85% EC (8.31) fold, B 94% EC (2.49) fold and Kz 95% EC gave (47.47) fold.  Y 85% EC showed the most effect against laboratory strain of A. fabae, followed by B 94% EC.  Results indicated that the mineral oil Kz 95% was the best efficient against T. urticae.