In this study, we investigated the effect of six endemic plants extracts (i.e. Saturejasahendica, S.khuzistanica, Scrophulariastriata, Thymbraspicata, Oliveriadecumbensand Vitexagnuscastus) as well as commercial insecticide (Acetamiprid: Mospilan®) against Bemisiatabaci(Hemiptera: Aleyrodidae)and some physiological responses in cucumber as host plants. The plant extracts and Acetamipridas chemical pesticide were sprayed on the plants with 250, 500 and 1000 ppm concentrations. All the extracts exhibited significantly different mortality of adults as compared with the control. The extracts of O. decumbensshowed the high mortality percentage of adult population as compared with other treatments. Results showed that the application of extracts and pesticide, especially in high concentrations,showed negative effects on plant and significantly increased malondialdehyde(MDA) accumulation and chlorophyll, proline and carbohydrate accumulation in cucumber leaves.Moreover, foliar spray with low concentrations of extract (250 and 500 ppm) enhanced cholorophyll content and decreased MDA and proline accumulation compared with control and Acetamipridtreated plants. It was concluded that these six extracts could be used as effective and environmentally sustainable bio-insecticides for the control ofB. tabaci(B biotype) without any adverse effects on host plants.
