COMPARATIVE EFFICIENCY OF PESTICIDES AND SOME PREDATORS TO CONTROL SPIDER MITES: II- BIOLOGICAL AND BEHAVIORAL CHARACTERISTICS OF PREDATORS Stethorus gilvifrons, Amblyseius gossipi AND Phytoseiulus macropili ANd THEIR HOST TWO SPOTTED SPIDER MITE, Tetranychus urticae UNDER SOME CHEMICALS TREATMENTS.

The effect of sub lethal doses of six compounds, three acaricides (abamectin, ethion and chorfenapyr),one pyrethroid (cyhalothrin),one mineral oil (Nat- 1) and one plant extract (Allium sativum)on somebiological and behavioral characteristics of the two spotted spider mite,Tetranychus urticae and adult female of predators Stethorus gilvifrons, Amblyseius gossipi, and Phytoseiulus macropilis was examined. The results indicated that Cyhalothrin was the most effective compound tested on egg deposition, which is beneficial for some IPM programs away from predators’ employments. A. sativum extract has the least effect on egg deposition that confers a chance to produce eggs enough for predation including egg mite, the preferable stage, for some predators. Ethion, chlorfenapyr and abamectin are considered ideal from the biological point of view since they decreased egg deposition to a suitable level and the character is needed for any integrated mite management program. Nat-1 is the best compound that has a moderate effecton egg deposition of spider mite which gave these compound special importance in integrated mite management. Nat-1 and A.sativum extract exhibited the least effective ovicidal action. The ovicidal effect of Chlorfenapyr and abamectin were about the same against the egg stage of spider mite. Cyhalothrin and ethion werehighly toxic compounds that caused the highest decrease in egg hatchability. Cyhalothrin and abamectin were the most effective on prey egg consumption, predator egg production and predator's egg hatchability of three predators. Ethion and chlorfenapyr occupy the next position in prey egg consumption, predator egg deposition and predator's egg hatchability of three predators. Nat-1 and A. sativum extract were the least effective compound in prey egg consumption, predator egg deposition and predator's egg hatchability of three predators.Also, Nat-1 and A.sativum extract were the safest compounds that allowedthe predator's egg to hatch producing the next stages necessary to thebiological agent to minimize prey populations.