Aphidicidal activity of rosemary, ajwain, yarrow, caraway and lavender on wheat common aphid (Schizaphis graminum)

Incurrent research, the aphidicidal effect of essential oils of rosemary, ajwain, yarrow, caraway and lavender on wheat common aphid (Schizaphis graminum) has been studied. Studied plants essential oils were extracted using hydro-distillation method and 2, 4, 6, 8, 10 and 12 per thousand concentrations of essential oils were prepared. Aphids collected from wheat and broomcorn Miyaneh farms, Iran transferred to cultured wheat plants in greenhouse condition. Essential oils concentrations were poured on 10 adult wingless aphids. The mortality percentage was calculated 2, 4, 6, 8, 10, 12 and 24 hours after treatment. Data were analyzed based on completely randomized design.  In concentration of 12 per thousand ajwan and yarrow had highest aphidicidal activity, while rosemary in 2 per thousand was more killer effect than others. Comparison of LC50 of studied plants essential oils after 24 hours showed that ajwain essential oils had more mortality effect on wheat common aphid than others. Alsso essenrial oils of yarrow, caraway and lavender had about same LC50 and rosemary was the weakest one. Essential oils of these plants could be considered as a natural pesticide for chemical pesticides replacement.