@article{article_620387, title={Chemical composition and insecticidal potential of different Origanum spp. (Lamiaceae) essential oils against four stored product pests}, journal={Turkish Journal of Entomology}, volume={44}, pages={149–163}, year={2020}, DOI={10.16970/entoted.620387}, author={Alkan, Mustafa}, keywords={Contact activity,essential oils,fumigant activity,GC-MS,Lamiaceae}, abstract={<p class="MsoBodyTextIndent2" style="margin:6pt 0cm;text-align:justify;text-indent:1cm;line-height:12.5pt;font-size:9pt;font-family:Arial, sans-serif;">This study was conducted to determine the contact and fumigant toxicity of plant essential oils extracted from four <i>Origanum </i> spp. against four stored product pests, <i>Rhyzopertha dominica </i> (F., 1792) (Coleoptera: Bostrichidae), <i>Tribolium confusum </i> Jacquelin Du Val, 1863 (Coleoptera: Tenebrionidae), <i>Sitophilus granarius </i> (L., 1875) and <i>Sitophilus oryzae </i> (L., 1763) (Coleoptera: Curculionidae). Chemical composition of the essential oils was determined using GC-MS. The trials were conducted under laboratory conditions in 2019 at Plant Protection Central Research Institute. Essential oils extracted from <i>Origanum onites </i> L. and <i>Origanum vulgare </i> L. var. <i>hirtum </i> caused 100% mortality of <i>R. dominica </i> and <i>T. confusum </i>. The computed LD50 value for <i>O. vulgare </i> var. <i>verticium </i> against <i>R. dominica </i> 24 h after application was 0.046 µl/insect. Single concentration fumigant study indicated that <i>O. onites </i> and <i>O. vulgare </i> var. <i>hirtum </i> essential oils cause high mortality (91 and 70%, respectively) of <i>R. dominica </i> within 24 h. Essential oils of <i>O. vulgare </i> showed the highest activity against <i>R. dominica </i> with LC50 and LC90 values of 0.0052 and 0.0144 µl/ml, respectively. The main components of <i>O. onites </i> essential oil were thymol (22.9%), γ-terpinene (13.0%), p-cymene (12.9%) and carvacrol (7.2%). Similarly, the essential oils of <i>O. vulgare </i> var. <i>hirtum </i> were composed of carvacrol (32.5%), thymol (16.1%), p-cymene (12.2%) and γ-terpinene (7.9%). Likewise, the essential oil of <i>O. vulgare </i> var. <i>verticium </i> had carvacrol (35.0%), p-cymene (11.6%), γ-terpinene (10.3%) and thymol (9.1%). Nonetheless, <i>O. vulgare </i> x <i>O. onites </i> essential oil had carvacrol (15.2%), cis-sabinene hydrate (14.6%), terpinen-4-ol (14.6%) and γ-terpinene (8.7%). <br /> </p> <p> </p>}, number={2}, publisher={Türkiye Entomoloji Derneği}