BACKGROUND _ 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 @entity1046 , @entity1324 and @entity1042 extracts of Andrographis paniculata, Eclipta prostrata and Tagetes erecta leaves tested for oviposition-deterrent, ovicidal and repellent activities against @entity311 vector, Anopheles subpictus Grassi (Diptera: Culicidae). METHODS: The dried leaves of the three plants were powdered mechanically and extracted with @entity1046 , @entity1324 and @entity1042 . One gram of crude extract was first dissolved in 100 ml of @entity1324 (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 @entity1046 , @entity1324 and @entity1042 extracts of A. paniculata, E. prostrata and T. erecta. The oviposition activity index (OAI) value of @entity1046 , @entity1324 and @entity1042 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 @entity1046 and @entity1042 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 @entity1046 extracts of A. paniculata, E. prostrata and @entity1042 extracts of T. erecta, and the mean complete protection time ranged from 120 to 150 min with the different extracts tested. INTERPRETATION _ CONCLUSIONS: The @entity1324 extract of A. paniculata, @entity1042 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.

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

@entity1042 :: ('MESH:D000432', 'Chemical') :: ['methanol'] @entity311 :: ('MESH:D008288', 'Disease') :: ['malaria'] @entity1324 :: ('MESH:D000096', 'Chemical') :: ['acetone'] @entity1046 :: ('MESH:C007650', 'Chemical') :: ['ethyl acetate']
@entity311 :: (MESH:D008288,Disease) :: ['malaria']
