title: Bioactivity of plant extracts on the larval and pupal stages of Aedes aegypti (Diptera, Culicidea).
abstract: BACKGROUND
  Aedes aegypti is responsible for the transmission of the dengue and yellow fever viruses. This study evaluated the effects of extracts from Cnidosculos phyllacanthus, Ricinus communis, and Coutarea hexandra on the developmental periods of A.aegypti larvae and pupae. Crude extracts of C. phyllacanthus and C. hexandra and oil from R. communis and C. phyllacanthus were used.
  
  
  METHODS
  Bioassays of the larvicidal and pupicidal effects of these products at different concentrations and times of exposure were evaluated. The lethal and sublethal effects were determined using different concentrations in larvicidal tests. Mortality data were evaluated by Probit analysis to determine the LC50 and LC90 values.
  
  
  RESULTS
  The vegetable oils from C. phyllacanthus and R. communis demonstrated greater efficiency for larval control with an LC50=0.28µl/mL and an LC90=1.48µl/mL and LC50=0.029µl/mL and a LC90=0.26µl/mL, respectively. In pupal tests toxic effects for all insects were verified after exposure to the products at significant LC50 and LC90 values for 24 and 48h. The effects of sublethal concentrations of C. phyllacanthus (oil) were more effective on the insects.
  
  
  CONCLUSIONS
  The vegetables oils from C. phyllacanthus and R. communis demonstrated greater potential from the control of different developmental periods in the life cycle of this insect.
authors: Laboratório de Entomologia, Núcleo de Sistemática e Bioecologia de Insetos, Departamento de Biologia, Universidade Estadual da Paraíba, Campina Grande, PB. lafayette.bio@bol.com.br
authors: Lafayette Pereira
authors: LP
authors: Candido
authors: Monica Tejo
authors: MT
authors: Cavalcanti
authors: Eduardo Barbosa
authors: EB
authors: Beserra
mesh_terms: D000330:Aedes / Q000187:drug effects*; D000818:Animals; D001681:Biological Assay; D019665:Euphorbiaceae / Q000737:chemistry*; D005260:Female; D007303:Insect Vectors / Q000187:drug effects*; D007814:Larva / Q000187:drug effects; D007928:Lethal Dose 50; D008297:Male; D010936:Plant Extracts / Q000494:pharmacology*; D010938:Plant Oils / Q000494:pharmacology*; D011679:Pupa / Q000187:drug effects; D019666:Rubiaceae / Q000737:chemistry*; D013997:Time Factors
chemical_list: D010936:Plant Extracts; D010938:Plant Oils