Abstract:The bio-insecticidal activity of the medicinal plants: Physalis angulate, Peganum harmala, Tecrium polium and Thymus vulgaris had been tested on fourth instar larvae of Culex pipiens molestus according to WHO protocol. LC50 and LC90 had been estimated after 24 and 48 hrs. exposure. As ascending values: LC50 at 24 hrs. were 1.8, 26.0, 34.0, and 45.0 ppm and at 48 hrs. were 1,5, 11.0, 23.0 and 38.5 ppm for P. angulate, P. harmala, T. polium and T. vulgaris respectively. The residual action determination for the … Show more
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