Efficacy of indigenous plant extracts on the malaria vector Anopheles subpictus Grassi (Diptera: Culicidae).

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dc.contributor.authorElango, G
dc.contributor.authorZahir, A Abduz
dc.contributor.authorBagavan, A
dc.contributor.authorKamaraj, C
dc.contributor.authorRajakumar, G
dc.contributor.authorSanthoshkumar, T
dc.contributor.authorMarimuthu, S
dc.contributor.authorRahuman, A Abdul
dc.date.accessioned2011-12-09T08:07:02Z
dc.date.available2011-12-09T08:07:02Z
dc.date.issued2011-09
dc.description.abstractBackground & objectives: Mosquito control is facing a threat due to the emergence of resistance to synthetic insecticides. Insecticides of plant origin may serve as suitable alternative biocontrol techniques in the future. The purpose of the present study was to assess the ethyl acetate, acetone and methanol extracts of Andrographis paniculata, Eclipta prostrata and Tagetes erecta leaves tested for oviposition-deterrent, ovicidal and repellent activities against malaria vector, Anopheles subpictus Grassi (Diptera: Culicidae). Methods: The dried leaves of the three plants were powdered mechanically and extracted with ethyl acetate, acetone and methanol. One gram of crude extract was first dissolved in 100 ml of acetone (stock solution). From the stock solution, test solution concentrations of 31.21- 499.42 mg/l for oviposition- deterrence assay and repellency and 15.60 - 998.85 mg/l were used in ovicidal assay. The percentage oviposition- deterrence, hatching rate of eggs and protection time were calculated. One-way analysis of variance was used for the multiple concentration tests and for per cent mortality to determine significant treatment differences. Results: The percentage of effective oviposition repellency was highest at 499.42 mg/l and the lowest at 31.21 mg/l in ethyl acetate, acetone and methanol extracts of A. paniculata, E. prostrata and T. erecta. The oviposition activity index (OAI) value of ethyl acetate, acetone and methanol extracts of A. paniculata, E. prostrata and T. erecta at 499.42 mg/l were -0.91, -0.93, -0.84, -0.84, -0.87, -0.82, -0.87, -0.89 and -0.87, respectively. Mortality (no egg hatchability) was 100 per cent with ethyl acetate and methanol extracts of A. paniculata, E. prostrata and T. erecta at 998.85 mg/l. The maximum adult repellent activity was observed at 499.42 mg/l in ethyl acetate extracts of A. paniculata, E. prostrata and methanol extracts of T. erecta, and the mean complete protection time ranged from 120 to 150 min with the different extracts tested. Interpretation & conclusions: The acetone extract of A. paniculata, methanol extract of E. prostrata and T. erecta showed good oviposition-deterrent, ovicidal and repellent activities respectively. These results suggest that the leaf extracts of A. paniculata, E. prostrata and T. erecta may have the potential to be used as an ideal eco-friendly approach for the control of the An. subpictus.en_US
dc.identifier.citationElango G, Zahir A Abduz, Bagavan A, Kamaraj C, Rajakumar G, Santhoshkumar T, Marimuthu S, Rahuman A Abdul. Efficacy of indigenous plant extracts on the malaria vector Anopheles subpictus Grassi (Diptera: Culicidae). Indian Journal of Medical Research. 2011 Sept; 134(3): 375-383.en_US
dc.identifier.urihttps://imsear.searo.who.int/handle/123456789/135771
dc.language.isoenen_US
dc.source.urihttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC3193720/en_US
dc.subjectAnopheles subpictusen_US
dc.subjectovicidalen_US
dc.subjectoviposition-deterrenten_US
dc.subjectplant extractsen_US
dc.subjectrepellent activitiesen_US
dc.subject.meshAcetates
dc.subject.meshAcetone
dc.subject.meshAnalysis of Variance
dc.subject.meshAndrographis --chemistry
dc.subject.meshAnimals
dc.subject.meshAnopheles --drug effects
dc.subject.meshEclipta --chemistry
dc.subject.meshIndia
dc.subject.meshInsect Vectors --drug effects
dc.subject.meshMethanol
dc.subject.meshMosquito Control --methods
dc.subject.meshOviposition --drug effects
dc.subject.meshOvum --drug effects
dc.subject.meshPlant Extracts --pharmacology
dc.subject.meshPlant Leaves --chemistry
dc.subject.meshTagetes --chemistry
dc.titleEfficacy of indigenous plant extracts on the malaria vector Anopheles subpictus Grassi (Diptera: Culicidae).en_US
dc.typeArticleen_US
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