Open AccessMosquito larvicidal and ovicidal activity of Delonix elata (L.) Gamble against Culex quinquefasciatus Say (Diptera: Culicidae)
Author(s) -
Marimuthu Govindarajan,
Mohan Rajeswary,
R Sivakumar
Publication year - 2012
Publication title -
asian pacific journal of tropical disease
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.208
H-Index - 33
ISSN - 2222-1808
DOI - 10.1016/s2222-1808(12)60223-0
Subject(s) - culex quinquefasciatus , instar , larva , biology , filariasis , culex , traditional medicine , veterinary medicine , toxicology , botany , medicine , zoology , aedes aegypti , helminths
Objective: To determine the larvicidal and ovicidal efficacy of different solvent leaf and\udseed extract of Delonix elata (D. elata) against filariasis vector Culex quinquefasciatus (Cx.\udquinquefasciatus). Methods: Twenty five early third instar larvae of Cx. quinquefasciatus were\udexposed to various concentrations and were assayed in the laboratory by using the protocol of\udWHO 2005. The larval mortality was observed after 24 h of treatment. The ovicidal activity was\uddetermined against Cx. quinquefasciatus mosquito to various concentrations ranging from 75-600\udmg/L under the laboratory conditions. Results: Among five solvent extracts tested the maximum\udefficacy was observed in the leaf and seed methanol extracts. The LC50 and LC90 values of D. elata\udagainst early third instar of Cx. quinquefasciatus were 124.84, 147.86 mg/L and 213.88, 289.43 mg/\udL\ud, respectively. No mortality was observed in controls. The Chi-square values were significant\udat P<0.05 level. Among five tested solvent, methanol extract was found to be most effective for\udovicidal activity against Cx. quinquefasciatus mosquito. 100% mortality was observed at 375 mg/\udL . Conclusions: From the results it can be concluded the crude extract of D. elata was an\udexcellent potential for controlling Cx. quinquefasciatus mosquito larvae and eggs