title: Larvicidal efficacy of botanical extracts against two important vector mosquitoes.
abstract: OBJECTIVE
  To determine the larvicidal efficacy of different solvent leaf extract of Ervatamia coronaria and Caesalpinia pulcherrima against Anopheles subpictus and Culex tritaeniorhynchus.
  
  
  METHODS
  Twenty five early third instar larvae of Anopheles subpictus and Culex tritaeniorhynchus were exposed to various concentrations and were assayed in the laboratory. The larval mortality was observed after 24 h of treatment.
  
  
  RESULTS
  Among three solvent extracts tested the maximum efficacy was observed in the methanol extract. The LC50 (LC90) values of Ervatamia coronaria and Caesalpinia pulcherrima against early third instar of Anopheles subpictus were 86.47 (159.59) and 113.26 (207.73) ppm and Culex tritaeniorhynchus were 131.53 (245.37) and 165.28 (299.45) ppm, respectively. No mortality was observed in controls.
  
  
  CONCLUSIONS
  From the results it can be concluded the crude extract of Ervatamia coronaria and Caesalpinia pulcherrima were excellent potential for controlling Anopheles subpictus and Culex tritaeniorhynchus mosquito larvae.
authors.affiliation: Division of Vector Biology and Phytochemistry, Department of Zoology, Annamalai University, Annamalainagar, India. drgovind1979@rediffmail.com
authors.forename: M
authors.initials: M
authors.lastname: Govindarajan
authors.forename: R
authors.initials: R
authors.lastname: Sivakumar
authors.forename: A
authors.initials: A
authors.lastname: Amsath
authors.forename: S
authors.initials: S
authors.lastname: Niraimathi
mesh_terms: D000085:Acetates; D000818:Animals; D000852:Anopheles / Q000502:physiology*; D001179:Arthropod Vectors / Q000502:physiology*; D001554:Benzene; D029911:Caesalpinia / Q000737:chemistry*; D003465:Culex / Q000502:physiology*; D007306:Insecticides / Q000633:toxicity*; D007814:Larva / Q000502:physiology; D007928:Lethal Dose 50; D000432:Methanol; D010936:Plant Extracts / Q000633:toxicity; D018515:Plant Leaves / Q000737:chemistry; D012997:Solvents; D030014:Tabernaemontana / Q000737:chemistry*
chemical_list: D000085:Acetates; D007306:Insecticides; D010936:Plant Extracts; D012997:Solvents; C007650:ethyl acetate; D001554:Benzene; D000432:Methanol