مشخصات پژوهش

One of the important effects of plants extracts and essential oils on insect’s behaviour is repellent activity that has a potential for utilization in pest management programs [1]. In this study, polar and non-polar extracts of some medicinal plants including Ageratum houstonianum (Mill.), Xanthium strumarium (L.), Achillea millefolium, Marrubium vulgare, Ranunculus repens, Delphinium linearilobum and Cupressus arizonica were prepared using maceration method. Choice test method was conducted for comparing repellent activity. A standard rectangle Plexiglas (27×11 cm) was used for tests. Artificial diet on the peace of filter paper containing 500 microliters of each extract in three concentrations (0.05, 0.025 and 0.125 mg/ml) were replaced in opposite position with non-treated artificial diet as control. Presence of 2nd larval instars of Spodoptera exigua around the test and control area were recorded each 1,6,24 and 48 hrs. The results revealed that with increasing the concentration of extracts repellent activity increased. The hexane extract of A. houstonianum showed non repellent activity. Acetone extract of X. strumarium compeletelly repeled the insects specially in concentration of 0.05 mg/ml. Hexane extract of X. strumarium and ethil acetat extrac of M. vulgare showed 88.88 and 90.75% repelent activity after 48 hours respectivily. Ethyl acetat extrac of A. millefolium and ethanol extract of D. linearilobum showed 75 and 80.5% repelency against 2nd larval instars of S. exiguae respectivily. In over all we thing that medicinal plants with affecting the behaviour of insects could use in IPM programs in addition with their advantage of safety in use on environment