title: Studies on effects of indigenous plant extracts on filarial vector Culex tritaeniorhynchus Giles.
abstract: Mosquito control is facing a threat because of the emergence of resistance to synthetic insecticides. Insecticides of botanical origin may serve as suitable alternative biocontrol techniques in the future. The purpose of the present study was to assess the effect of leaf ethyl acetate, acetone and methanol extracts of Aegle marmelos (L.) Correa ex Roxb (Rutaceae), Andrographis lineata Wallich ex Nees. (Acanthaceae), Andrographis paniculata (Burm.f.) Wall. ex Nees. (Acanthaceae), Cocculus hirsutus (L.) Diels (Menispermaceae), Eclipta prostrata L. (Asteraceae) and Tagetes erecta L. (Compositae) on ovicidal and oviposition-deterrent activities against Culex tritaeniorhynchus Giles (Diptera: Culicidae). The percentage of egg hatching in methanol extracts of Andrographis lineata, Cocculus hirsutus and T. erecta were 16, 12 and 16 exerted at 500 ppm, respectively. The percentage of effective oviposition repellency was 97.77 at 500 ppm and the lowest repellency was 42.06 at 31.25 ppm in methanol and acetone extracts of Andrographis lineata and Andrographis paniculata, respectively. The oviposition activity index values revealed that the solvent plant extracts have deterrent effect, and they caused a remarkable negative response resulting in oviposition of very few eggs. These results suggest that the leaf solvent plant extracts have the potential to be used as an ideal ecofriendly approach for the control of the Culex tritaeniorhynchus.
authors.affiliation: Unit of Bioactive Natural Products, Post Graduate and Research Department of Zoology, C. Abdul Hakeem College, Melvisharam, 632 509, Vellore District, Tamil Nadu, India.
authors.forename: G
authors.initials: G
authors.lastname: Elango
authors.forename: A Abdul
authors.initials: AA
authors.lastname: Rahuman
authors.forename: C
authors.initials: C
authors.lastname: Kamaraj
authors.forename: A Abduz
authors.initials: AA
authors.lastname: Zahir
authors.forename: A
authors.initials: A
authors.lastname: Bagavan
mesh_terms: D000818:Animals; D003465:Culex / Q000187:drug effects*; D007302:Insect Repellents / Q000302:isolation & purification / Q000494:pharmacology*; D007306:Insecticides / Q000302:isolation & purification / Q000494:pharmacology*; D010936:Plant Extracts / Q000302:isolation & purification / Q000494:pharmacology*; D018515:Plant Leaves / Q000737:chemistry; D010944:Plants / Q000737:chemistry*
chemical_list: D007302:Insect Repellents; D007306:Insecticides; D010936:Plant Extracts