Toxicity and Oviposition Deterrent Activities of Thyme Essential Oils against Anopheles arabiensis

Background. Malaria is one of the deadliest mosquito-borne diseases in sub-Saharan Africa and Ethiopia. Owing to their costs environmental issues, synthetic insecticides are poor choices control mosquitoes. Plant-based products can be considered as safe biodegradable alternatives. The present study aimed test toxicity oviposition deterrent activities Thymus serrulatus schimperi essential oils (EOs) against Anopheles arabiensis. Methods. Thyme EOs were extracted by hydrodistillation using Clevenger-type apparatus. They named Tar, Ala, Yil after areas thyme collection Tarmaber, Alamata, Yilmana Densa, respectively. Laboratory-based tests used determine larvicidal, adulticidal, deterrent, half lethal dose (LD50) each EO. Results. concentrations 100 μl/L 50 resulted complete mortalities larvae adults, respectively, for all three Eos considered. exhibited high repellency with activity index −1 (OAI = −1) at (Tar), (Ala), 200 (Yil). Conclusions. T. effective adult mosquitoes small doses deterrence from μl/L. Thus, these promising mosquitocides deterrents. But, further both presence already known deterrents field trials required.