Chemical composition of Eucalyptus spp. essential oils and their insecticidal effects on Lutzomyia longipalpis |
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| Authors: | MV Maciel SM Morais CML Bevilaqua RA Silva RS Barros RN Sousa LC Sousa ES Brito MA Souza-Neto |
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| Institution: | 1. Ceará State University, Postgraduate Program in Veterinary Science, Laboratory of Parasitic Diseases, Av. Paranjana 1700, CEP 60740-903 Fortaleza, Ceará, Brazil;2. Ceará State University, Laboratory of Natural Products Chemistry, Ceará, Brazil;3. Ceará State Health Secretariat, Entomology Laboratory of the Center for Vector Control, Ceará, Brazil;4. Embrapa Tropical Agroindustry Research Unit, Ceará, Brazil |
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| Abstract: | The chemical composition of essential oils from three species of plants belonging to the Eucalyptus genus was determined and, their insecticidal effects on egg, larva and adult phases of Lutzomyia longipalpis were assessed. The insects were collected in the municipality of Sobral in the State of Ceará, Brazil. Five treatments with different concentrations were performed along with two negative controls, distilled water and Tween 80 (3%), and a positive control, cypermethrin (0.196 mg/ml). The tests were carried out in plastic pots internally coated with sterile plaster and filled with a substrate made of rabbit feces and crushed cassava leaves. The eggs, larvae and adults were sprayed with the oils. The hatched larvae were counted for 10 consecutive days and observed until pupation. Insect mortality was observed after 24, 48 and 72 h. E. staigeriana oil was the most effective on all three phases of the insect, followed by E. citriodora and E. globulus oils, respectively. The major constituents of the oils were Z-citral and alpha-citral (E. staigeriana), citronellal (E. citriodora) and 1,8-cineole (E. globulus). The Eucalyptus essential oils constitute alternative natural products for the control of L. longipalpis since the median effective concentration (EC50) values revealed relevant action as compared with other natural products, some of their chemical constituents are already known for their insecticidal activity and these oils are produced in commercial scale in Brazil. |
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| Keywords: | Eucalyptus Lutzomyia longipalpis Essential oils Insecticides Insect control |
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