Bioactivities and Synergistic Effect of Elsholtzia ciliata Essential Oil and Its Main Components against Lasioderma serricorne

Investigations have shown that storage bugs seriously harm grains during storage. In the interim, essential oils (EOs) have been proven to be a good botanical pesticide. The anti-Lasioderma serricorneproperties ofElsholtzia ciliataessential oil, which was obtained by steam distillation, were evaluated usingDL-limonene, carvone, and their two optical isomer components using contact, repelling, and fumigation techniques. Simultaneously, the fumigation, contact, and repellent activities of carvone and its two optical isomers mixed withDL-limonene againstL. serruricornewere evaluated. The results showed thatE. ciliata,its main components (R-carvone,DL-limonene), andS-carvone exhibited both fumigations (LC50= 14.47, 4.42, 20.9 and 3.78 mg/L) and contact (LD50= 7.31, 4.03, 28.62 and 5.63 µg/adult) activity againstL.serricorne.A binary mixture (1:1) ofR-carvone andDL-limonene displayed an obvious synergistic effect. A binary mixture (1:1) of carvone and its two optical isomers exhibited an obvious synergistic effect, too. Furthermore, the repellent activity of the EO, carvone, and its two optical isomers,DL-limonene, and a combination of them varied. To stop insect damage during storage,E. ciliataand its components can be utilized as bio-insecticides.