Details

Autor(en) / Beteiligte

• Gallon, Carine
• Martello, Rafael Henrique
• Cozzer, Gilberto
• Rezende, Cássia Alves Lima
• Calisto, Jean Felipe Fossá
• Floss, Paulo Afonso
• Oliveira, J. Vladimir
• Rezende, Renan de Souza
• Dal Magro, Jacir
• Albeny‐Simões, Daniel

Titel

Chemistry matters: biological activity of Eucalyptus essential oils on mosquito larval mortality

Ist Teil von

• Entomologia experimentalis et applicata, 2020-05, Vol.168 (5), p.407-415

Ort / Verlag

Amsterdam: Wiley Subscription Services, Inc

Erscheinungsjahr

2020

Quelle

Wiley Online Library Journals Frontfile Complete

Beschreibungen/Notizen

• The mosquito Aedes aegypti L. (Diptera: Culicidae) is a vector of arboviral diseases such as dengue fever. Currently, the main approach to mosquito control is the application of synthetic insecticides, which can lead to negative environmental impacts and insecticide resistance in mosquito populations. As such, there has been increased interest in developing alternative methods for control of vector populations such as utilizing plant compounds that act as larvicides. The aim of this work is to evaluate the effectiveness of Eucalyptus sp. (Myrtaceae) essential oils for control of Ae. aegypti larvae. The essential oils of seven Eucalyptus species and hybrids were extracted by hydrodistillation and analyzed by gas chromatography coupled to mass spectrometry. The essential oils were further diluted in water with acetone (0.40%) at the following concentrations: 100, 50, 25, and 10 μg ml−1. Mortality trials were conducted in plastic containers with a solution of ultrapure water and 200 μl of diluted oil for a total volume of 50 ml per treatment. The experiments for each Eucalyptus species/hybrid and concentration were performed in triplicate, using a control containing only water and acetone. Twenty larvae were added to each container and mortality was recorded at 1, 2, 4, and 24 h. The Eucalyptus essential oils showed larvicidal activity in most of the evaluated concentrations, mainly at 50 and 100 μg ml−1. Eucalyptus benthamii Maiden & Cambage and the hybrid Urograndis displayed the highest larvicidal potential (100% at 24 h) in the 100 μg ml−1 treatment. Larval mortality of Ae. aegypti showed a positive correlation with the compounds γ‐, o‐cymol, o‐cymene, terpineol, 3‐dodecylfuran‐2,5‐dione, α‐pinene, globulol, and ledol. The most abundant compounds identified in the essential oils were 1,8‐cineole and α‐pinene. These results highlight the potential of using Eucalyptus essential oils for the isolation of natural larvicidal products. Our research chemically analyzed the essential oils of seven Eucalyptus species and hybrids (Myrtaceae) and tested for the lethal effects against larvae of Aedes aegypti (Diptera: Culicidae). We also discuss the role of chemical compounds in inflicting mosquito larval mortality. Using a multivariate statistical analysis, we could point out the importance of each chemical compound on directly affecting mosquito larval mortality. The results highlight the potential of Eucalyptus essential oils for the isolation of larvicidal products.