الفهرس 
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Abstract
The present study was directed to evaluate the relative toxicity of six chemicals, three are known acaricides (abamectin, fenpyroximate, chlorfenapyr), one pyrethroid (cyhalothrin), one mineral oil (supermasrona) and one plant extract (Nigella sativa) against the adult females of two spotted spider mite Tetranychus urticae and the adult females of predatory mite Phytoseiulus persimilis using standardized method for bioassay. The results indicated that abamectin has a special position in mite chemical control or in integrated mite management because of its high toxic effect and its high toxicity index, while N. sativa extract was the least toxic compound to adult female T. urticae on different host plants. Supermasrona and N. Sativa extract were the safest compounds to the adult of predatory mite P. persimilis on different host plants. Fenpyroximate has the highest selectivity index and highest selectivity ratio in spite of its low safety values on different host plants, so it can be recommended in IPM program. Also to evaluate the effects of sublethal doses of these chemicals on some biological aspect of the mite T. urticae and its predatory mite P. persimilis The study also was undertaken to determine the rate of NPK in relation to spider mite and its predatory mite. Cyhalothrin was the most effective compound tested on egg deposition of T. urticae which is beneficial for some IPM programs, while N. Sativa extract has the least effect on egg deposition. Cyhalothrin, Fenpyroximate and supermesrona were highly toxic compounds that caused the highest decrease in egg hatchability of T. urticae on different host plants. Cyhalothrin and abamectin were the most effective on prey egg consumption, predator egg production and predator egg hatchability of P. persimilis, While N. Sativa extract was the least effective compound in prey egg consumption, predator egg deposition and predator egg hatchability on different host plants. It is clear that cucumber has the highest rates of the three elements under study (NPK).