EFFECTS OF FIVE PLANT EXTRACTS AGAINST TWO SPOTTED SPIDER MITES Tetranychus Urticae KOCH (ACAM: TETRANYCHIDAE)

The present study was conducted to determine the direct and residual effects of the five natural plant extracts, the aerial parts of Peppermint Mentha piperita, Marjoram Origanum marjorana, Mugwort Artemisia vulgaris, cloves of Clove Syzygium aro-maticum and the leaves and mature fruit pods of Egyptian acacia Acacia nilotica using soxhelt extractor, against the two spotted spider mite, Tetranychus urticae Koch, at the laboratory-controlled conditions, 30±2C° and 70±5% RH. Two concentrations, 0.25% and 0.5% were utilized to study its effects on the biological aspects of T. urticae. The results confirmed the effective influence of these extracts on mite life aspects which altered and prolonged the mite life cycle and generation time, the high prolonged life cycle lasted 13.98 days and the generation period reach 15.78 days for Acacia 0.25%, followed by the rest treatments, while control recorded the short life cycle 9.33 days and located the last significant group of generation period by 10.19 days. Meanwhile, the total immature stages which treated with Acacia 0.25% elongated the time lasted to reach adult stage (8.72 days), with significant differences with the rest treatments and control except Mentha 0.25% and Artemisia 0.5%, followed by Acacia 0.50% (7.18 days). Moreover, the used extracts also achieved the high mortality percentages, reached 64.20% and 50.62% in pre-oviposition period and post-oviposition period respectively, when treated with the highest concentration of Artemisia extract. Reduction in Fecundity achieved 57.09% and 57.02% at concentrations 0.25% and 0.5% of Syzyg-ium, respectively.