Insecticidal and Repellent Activity of Essential Oils from Seven Different Plant Species against (Coleoptera: Tenebrionidae).

(Herbst) (Coleoptera: Tenebrionidae) is the most destructive pest of stored grain commodities. To control the attack of this insect pest, it is important to develop non-hazardous alternatives to replace fumigants. This study examined the fumigant toxicity and repellent activity of seven essential oils (, , and ) against adult under controlled laboratory conditions. The fumigant toxicity and repellent activities of essential oils were tested using five different doses (62.5, 125, 250, 500, and 1000 µg) in vapour-phase fumigation and four-arm olfactometer bioassays, respectively. In vapor-phase fumigation bioassays, mortality data were recorded after 24, 48, and 72 h. The results showed that and essential oils are potential fumigants against adult . In repellency bioassays, a one-week-old adult population of was used to test the repellency potential of the essential oils. The results indicated that and had significant repellency potential against . Overall, we conclude that these essential oils have strong repellent and fumigant properties and can be used as potential repellent compounds to deter the insects.