title: Chemical composition of Rosmarinus and Lavandula essential oils and their insecticidal effects on Orgyia trigotephras (Lepidoptera, Lymantriidae).
abstract: OBJECTIVE
  To evaluate toxic activities of essential oils obtained from Rosmarinus officinalis and Lavandula stoechas against the fourth larval instars of Orgyia trigotephras.
  
  
  METHODS
  A total of 1 200 larvae were divided into three groups I II III. Group I was to investigate the effect of extracted essential oils from these aromatic plants as gastric disturbance. Bacillus thuringiensis and ethanol were used as control group. Group II was used as contact action and Group III was used as fumigant action. Decis and ethanol were used as control group. During the three experiments, the effect of essential oils on larvae was assessed.
  
  
  RESULTS
  The chemical composition of essential oils from two medicinal plants was determined and, their insecticidal effects on the fourth larval state of Orgyia trigotephras were assessed. The two simples presented an insecticidal activity, nevertheless Rosmarinus officinalis essential oil was less efficient compared to Lavandula stoechas one are discussed.
  
  
  CONCLUSIONS
  The relationship between the chemical composition and the biological activities is confirmed by the present findings. Therefore the potential uses of these essential oils as bioinsecticides can be considered as an alternative to the use of synthetic products.
authors.affiliation: Institut Supérieur des Sciences et Technologies de l'Environnement de Borj-Cédria, B.P. 1003, Hammam-Lif 2050 - Tunisia. Electronic address: Benslimane.badreddine@yahoo.fr.
authors.forename: Ben Slimane
authors.initials: BS
authors.lastname: Badreddine
authors.affiliation: Institut National de Recherche en Génie Rural, Eaux et Forêts, Tunis. Tunisia.
authors.forename: Ezzine
authors.initials: E
authors.lastname: Olfa
authors.affiliation: Institut National de Recherche en Génie Rural, Eaux et Forêts, Tunis. Tunisia.
authors.forename: Dhahri
authors.initials: D
authors.lastname: Samir
authors.affiliation: Institut National des Sciences Appliquées et Technologiques. Tunis. Tunisia.
authors.forename: Chograni
authors.initials: C
authors.lastname: Hnia
authors.affiliation: Institut National de Recherche en Génie Rural, Eaux et Forêts, Tunis. Tunisia.
authors.forename: Ben Jamaa Mohamed
authors.initials: BJ
authors.lastname: Lahbib
keywords: Essential oils; Insect control; Lavandula; Orgyia trigotephras; Rosmarinus