Repellent Constituents of Essential Oil of Cymbopogon distans Aerial Parts against Two Stored-Product Insects

Abstract

The screening for bioactive principles from several Chinese medicinal herbs showed that the essential oil of Cymbopogon distans aerial parts possessed strong repellency against the booklouse, Liposcelis bostrychophila , and the red flour beetle, Tribolium castaneum . A total of 36 components of the essential oil were identified by GC and GC-MS. trans-Geraniol (16.54%), (R)-citronellal (15.44%), (+)-citronellol (11.51%), and α-elemol (9.06%) were the main components of the essential oil followed by β-eudesmol (5.71%) and (+)-limonene (5.05%). From the essential oil, four monoterpenes were isolated by bioassay-guided fractionation. The compounds were identified as limonene, citronellol, citronellal, and trans-geraniol. Geraniol and citronellol were strongly repellent against the booklouse, L. bostrychophila, whereas citronellal and limonene exhibited weak repellency against the booklouse. Geraniol and citronellol exhibited comparable repellency against the booklouse relative to the positive control, DEET. Moreover, geraniol and citronellol exhibited stronger repellency against the red flour beetle than DEET, whereas the two other compounds showed the same level of repellency against the red flour beetle compared with DEET.

Bioactivity of Essential Oil from <i>Artemisia stolonifera</i> (Maxim.) Komar. and Its Main Compounds against Two Stored-Product Insects

“…The repellent activity to T. castaneum and L. serricorne adults was tested using the area preference method 12 . Petri dishes 9 cm in diameter were used to confine red flour beetles and cigarette beetles during the experiment.…”

Bioactivities and Chemical Constituents of Essential Oil Extracted from <i>Artemisia anethoides</i> Against Two Stored Product Insects

“…The repellent activity of the essential oil against T. castaneum and L. serricorne were investigated based on the method described by Zhang et al 17 . Range-finding studies were run to determine the appropriate testing concentrations.…”

Chemical Composition of Essential Oils from <i>Zanthoxylum bungeanum</i> Maxim. and Their Bioactivities against <i>Lasioderma serricorne</i>

“…The repellent activity of the two essential oils and pure compounds towards L. serricorne adults were performed using area perference methods 1,27 . The essential oils and compounds were dissolved separately in n-hexane to different concentrations 39.32, 7.86, 1.57, 0.31, and 0.06 nL/ cm 2 , and n-hexane was used as blank control.…”