اثرات سمیت اسانس های پونه، گلپر، بومادران روی لارو سن اول کفشدوزک (Hippodamia variegata (Goeze

Ladybird Hippodamia variegata (Goeze) is one of the most important pest predators in agricultural ecosystems. due to the adverse effects of chemical toxins, in the last few decades there are wide range of research on the use of plant compounds, especially essential oils, as insecticides. in the present study, the lethal effects of essential oil of plants (Mentha pulegium L.), (Heracleum persicum Desf) and (Achillea millefolium L.) on the first instar larvaes of H. variegata In vitro, temperature of 25±2 ° C, relative humidity of 65±5% and photoperiod of 16 hours of light and 8 hours of darkness were maintained. essential oil of plants M. pulegium, H. persicum and A. millefolium were hydro distilled using modified Clevenger type apparatus and extracted. biometric tests were performed into the 250 ml glass containers. in each experiment 20 the first instar larvaes of ladybird H. variegata with sufficient density of the host aphid, it was placed in each glass container. after performing preliminary experiments and determining the amplitudes by logarithmic method, the main experiments were performed with 5 concentrations along with the control and in 4 replications. deaths were recorded after 24 hours. lethal dose of LC50 for essential oils H. persicum, M. pulegium and A. millefolium 0.740, 3.480, 7.416 microliters per liter of air were calculated, respectively. according to the results, obtained essential oil M. pulegium the most toxicity and essential oil H. persicum showed the lowest toxicity on the first instar larvae of ladybirds. as a result, considering that H. persicum essential oil had the least adverse effect among the tested essential oils, therefore this essential oil can be used in combination with ladybird H. variegata in integrated pest management programs.