Ovicidal activity of Ageratum houstonianum Mill. (Asteraceae) leaf extracts against Anopheles stephensi, Aedes aegypti and Culex quinquefasciatus (Diptera: Culicidae)
Journal Title: Asian Pacific Journal of Tropical Disease - Year 2015, Vol 5, Issue 3
Abstract
Objective: To study the ovicidal activity of Ageratum houstonianum (A. houstonianum) leaf extracts against the eggs of vector mosquitoes and to develop additional tools for the control of mosquito-borne diseases. Methods: The ovicidal activity of crude hexane, ethyl acetate and methanol leaf extracts of A. houstonianum were assayed for their toxicity against the eggs of three important vector mosquitoes, viz., Anopheles stephensi, Aedes aegypti and Culex quinquefasciatus at concentrations of 2.5, 5.0, 10.0 and 20.0 mg/L of the crude extract. Results: All extracts showed activity. The minimum concentration at which maximum egg mortality rate of 80% and above obtained was 10.0 mg/L in the case of methanol and ethyl acetate against Anopheles stephensi and Aedes aegypti respectively and 5.0 mg/L in ethyl acetate extract against Culex quinquefasciatus. One hundred per cent egg mortality was obtained only in ethyl acetate extract at 20.0 mg/L against Aedes aegypti. Conclusions: The crude leaf extracts of A. houstonianum did not exhibit potential ovicidal activity against the vector species studied. Among the crude leaf extracts tested, the activity of ethyl acetate extract was more effective. More research on the screening of phytochemicals as a potential ovicidal agent is warranted to add more tools in the control of mosquitoes.
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Molecular characterization of Mycobacterium tuberculosis isolates from Kandy, Sri Lanka
Objective: To determine tuberculosis epidemiology in Kandy, Sri Lanka. Methods: IS6110 RFLP and spoligotyping analyses were performed on 100 Mycobacterium tuberculosis (M. tuberculosis) clinical isolates from Kandy distr...
Evaluation of different extraction methods on antimicrobial potency of Adenium obesum stem against food borne pathogenic bacterial strains in Oman
Objective: To determine and compare the effect on antimicrobial potency of crude stems extract of Adenium obesum (A. obesum) by Soxhlet and maceration extraction methods. Methods: The crude extracts were prepared from th...
Stomoxyini fly fauna of the Khao Yai National Park, Thailand
Objective: To determine species diversity, relative population abundance and diurnal activity of the Stomoxyini flies at the Khao Yai National Park. Methods: Stomoxyini flies were collected bimonthly from February to Jun...
Rosmarinic acid treatment alleviates fibrotic changes in the myocardium induced in a rat model of insulin resistance
Objective: The objective of the present study is to investigate whether rosmarinic acid (RA) could prevent cardiac fibrosis induced in a rat model of insulin resistance. Methods: Insulin resistance was induced in rats by...