Insecticidal effects of Thuja occidentalis L. essential oil on adults of Lasioderma serricorne F. (Col.: Anobiidae) under laboratory conditions

In order to find recyclable, environment friendly and easy accessible insecticides, the essential oils of Thuja occidentalis L. (Cupressaceae), was used against the adults of Lasioderma serricorne F. (Col.: Anobiidae). The analysis of T. occidentalis essential oil used for insect fumigation by phase gas chromatography revealed the presence of 22 compounds including α-thujone (49.64%), fenchone (14.06%), and β-thujone (8.98%). The experiment was conducted in 6 replications using a completely randomized design of factorial experiment. The essential oil was extracted by water distillation method. Experiment was carried out at 30 ± 2 °C and 60 ± 5% R. H. under dark condition. Treatments consisted of 5 concentrations of essential oil with three replications for each concentration. Each replication contained 20 adults of 7-14-day old. According to the results, the studied oil showed a significant lethality against the adults of Lasioderma serricorne. LC50 value for the oil of T. occidentalis, in this experiment was 246 μl/l airs for L. serricorne.