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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
Insecticidal activity of the essential oil from fruits and seeds of Schinus terebinthifolia Raddi against African malaria vectors
Parasites and Vectors, Volume 4, No. 1, Article 129, Year 2011
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Description
Background: Alternative insecticides for the control of malaria and filarial vectors are of paramount need as resistance is increasing among classes of insecticides currently in use in the public health sector. In this study, mosquitocidal activity of Schinus terebinthifolia essential oil against Anopheles gambiae s.s., An. arabiensis and Culex quinquefasciatus was assessed in laboratory, semi- field and full- field conditions. Method. Twenty third instar larvae of both Anopheles gambiae s.s. and Cx. quinquefasciatus were exposed to different dosages of plant extract in both laboratory and semi- field environments. Observation of the mortality response was assessed at intervals of 12, 24, 48 and 72 hours. Adult semi- gravid female mosquitoes were exposed to papers treated with S. terebinthifolia and compared with WHO standard paper treated with alphacypermethrin (0.05%). Results: Gas chromatography, coupled to mass spectrometry, identified 15 compounds from S. terebinthifolia extracts, the most abundant identified compound was -3-carene (55.36%) and the least was -elemene (0.41%). The density of the oil was found to be 0.8086 g/ml. The effective dosages in the insectary ranged from 202.15 to 2625.20 ppm and were further evaluated in the semi- field situation. In the laboratory, the mortality of Cx. quinquefasciatus ranged from 0.5 to 96.75% while for An. gambiae s.s it was from 13.75 to 97.91%. In the semi- field experiments, the mortality rates observed varied for both species with time and concentrations. The LC 50and LC95value in the laboratory was similar for both species while in the semi- field they were different for each. In wild, adult mosquitoes, the KT50for S. terebinthifolia was 11.29 minutes while for alphacypermethrin was 19.34 minutes. The 24 hour mortality was found to be 100.0% for S. terebinthifolia and 75.0% for alphacypermethrin which was statistically significant (P < 0.001). Conclusion: The efficacy shown by essential oils of fruits and seeds of S. terebinthifolia has given an opportunity for further investigation of individual components of these plant extracts and to evaluate them in small- scale field trials. © 2011 Kweka et al; licensee BioMed Central Ltd.
Authors & Co-Authors
Kweka, Eliningaya J.
Tanzania, Arusha
Tropical Pesticides Research Institute
Tanzania, Moshi
Kilimanjaro Christian Medical University College
Nyindo, Mramba B.A.
Tanzania, Moshi
Kilimanjaro Christian Medical University College
Mosha, Franklin W.
Tanzania, Moshi
Kilimanjaro Christian Medical University College
Gomes Da Silva, Ary Gomes
Brazil, Vila Velha
Universidade Vila Velha
Statistics
Citations: 77
Authors: 4
Affiliations: 3
Identifiers
Doi:
10.1186/1756-3305-4-129
e-ISSN:
17563305
Research Areas
Infectious Diseases
Participants Gender
Female