Impacts of six ethanolic plant extracts on feeding and developmental time of Tetranychus urticae

Ashrafju, M. and Ahmadi, K. and Purhematy, A. (2014) Impacts of six ethanolic plant extracts on feeding and developmental time of Tetranychus urticae. Acta Phytopathologica et Entomologica Hungarica, 49 (2). pp. 245-251. ISSN 0238-1249

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Abstract

Development in chemical pesticides and the problems caused by the indiscriminate use of them, has led to the rise of new ways to control pests. The use of plant-based compounds is a proposed method, because they have far less destructive effects on the environment. Study of all aspects and effects of a botanical insecticide is required, such as feed rate which is assessed on Tetranychus urticae Koch. Individual leaves were sprayed with 6 ethanolic extracts (Aloe vera, Melia azedarach, Calendula officinalis, Syzygium aromaticum, Peganum harmala and Juglans regia) with concentration of 4 mg.mL⁻¹, and then starved mites (larvae) were laid on them. Feeding rate was determined by the color of chlorophyll inside the body. Finally, M. azedarach, A. vera, P. harmala and C. officinalis decreased the feeding rate, specially M. azedarach extract caused almost 50% decrease in the first day, 30% in the second day and 20% in the third day. According to the last experiment, the mean of total developmental time of M. azedarach treatment was significantly longer than control treatment.

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