Susceptibility of adult pest population strains of Tribolium castaneum (Tc), Rhyzopertha dominica (Rd) and Callosobruchus maculatus (Cm) from Tunisia and Algeria was assessed after exposure to two Eucalyptus essential oils namely Eucalyptus lehmani and Eucalyptus astringens. Results demonstrated a distinct insect susceptibility depending upon their origin and essential oils. For all bioassays, Tunisian strains were more resistant and E. lehmani essential oil was more toxic. At the LC50 level, the order of adult sensitivity was rated to be: R. dominica > C. maculatus > T. castaneum. In fumigation trial, E. lehmani vapor destroyed all adults of both strains of Rd and resulted in a complete control with a concentration of 50 μl/l air after 48 h of exposure, while, with Cm, the oil achieved, respectively, 68.33 and 46.36% mortality of Algerian and Tunisian strains. Moreover, regarding Tc, mortalities reached 13.46 and 23%, respectively, with Algerian and Tunisian strains. E. lehmani oil toxicity could be attributed to its chemical composition mainly 1,8 cineole (34.56%).
Based on this study, interesting results were provided regarding Eucalyptus essential oils insecticidal potential. However, knowledge on how insect strains respond to essential oils will allow designing more effective management strategies for pest control throughout Maghreb countries.
Susceptibility of adult pest population strains of Tribolium castaneum (Tc), Rhyzopertha dominica (Rd) and Callosobruchus maculatus (Cm) from Tunisia and Algeria was assessed after exposure to two Eucalyptus essential oils namely Eucalyptus lehmani and Eucalyptus astringens. Results demonstrated a distinct insect susceptibility depending upon their origin and essential oils. For all bioassays, Tunisian strains were more resistant and E. lehmani essential oil was more toxic. At the LC50 level, the order of adult sensitivity was rated to be: R. dominica > C. maculatus > T. castaneum. In fumigation trial, E. lehmani vapor destroyed all adults of both strains of Rd and resulted in a complete control with a concentration of 50 μl/l air after 48 h of exposure, while, with Cm, the oil achieved, respectively, 68.33 and 46.36% mortality of Algerian and Tunisian strains. Moreover, regarding Tc, mortalities reached 13.46 and 23%, respectively, with Algerian and Tunisian strains. E. lehmani oil toxicity could be attributed to its chemical composition mainly 1,8 cineole (34.56%).Based on this study, interesting results were provided regarding Eucalyptus essential oils insecticidal potential. However, knowledge on how insect strains respond to essential oils will allow designing more effective management strategies for pest control throughout Maghreb countries.
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