Repellent activities of essential oil extracts from five Artemisia species against Lasioderma serricorne and Liposcelis bostrychophila

For green control against Lasioderma serricorne and Liposcelis bostrychophila, a laboratory experiment was conducted to investigate the repellent activities of essential oils extracted from five species of Genus Artemisia (A. dubia, A. roxburghiana, A. rubripes, A. sacrorum and A. giraldii) against the two pests in stored tobacco. The repellent rates of the five essential oils were evaluated at ten test concentrations (78.63, 15.73, 3.15, 0.63 and 0.13 nL/cm² for L. serricorne; 31.58, 6.32, 1.26, 0.25 and 0.05 nL/cm² for L. bostrychophila). The results showed that:1) At the concentration of 78.63 nL/cm², the essential oil of A. rubripes presented the strongest repellent activity against L. serricorne with up to 98% repellent rate, and this was followed by the essential oils of A. sacrorum and A. giraldii. The repellent duration time of A. giraldii essential oil was longer than the other essential oils, with its repellent rate still reaching 96% after 4 h. 2) At the concentration of 31.58 nL/cm², the repellent effect of A. dubia essential oil was the most significant against L. bostrychophila, its repellent rate was up to 96%. 3) The repellent effects of the five essential oils were weaker against the two pests at lower concentrations. In conclusion, the essential oils extracted from the five plants presented significant repellent effects against the two pests in stored tobacco at certain concentrations and duration.