Chemical composition, antimicromicrobial activity and insecticidal activity against the lesser mealworm <scp> Alphitobius diaperinus </scp> (Panzer) (Coleoptera: Tenebrionidae) of <scp> Origanum vulgare </scp> L. ssp. hirtum (Link) and <scp> Artemisia dracunculus </scp> L. essential oils

Background: Essential oils (EOs) from Artemisia dracunculus L. and Origanum vulgare L. ssp. hirtum were obtained and the qualitative and quantitative chemical composition of the extracts was investigated. The insecticidal activity of EOs against the larval stages of Alphitobius diaperinus (Panzer) was studied. Moreover, the antimicrobial activity of these oils against pathogens transmitted by this pest was also investigated.; Results: The obtained results indicate the possibility of using Greek oregano EO with a high content of carvacrol as a feed additive in poultry nutrition. The use of the Greek oregano oil at 1% (w/w) dose showed stronger reduction of body weight gain of stage IV larvae. Their body mass was only 10.92% of the control. Moreover, EOs from O. vulgare strongly inhibited the growth of tested bacterial strains as well as Candida albicans.; Conclusion: Greek oregano EO may be a good alternative to antibiotic growth promoters and coccidiostats whose use in feeding farm animals has been prohibited since January 2006 under European Union directives. The introduction of O. vulgare L. ssp. hirtum EO into the premises of farm and poultry houses may help to improve sanitary conditions and control of the lesser mealworm inhabiting these buildings. &#169; 2017 Society of Chemical Industry.; &#169; 2017 Society of Chemical Industry.