Lutte contre les trois bruches Acanthoscelides obtectus (Say, 1893), Bruchus rufimanus Boheman, 1833 et Collosobruchus maculatus (Fabricius, 1775) (Coleoptera: Chrysomelidae : Bruchinae) par les huiles essentielles extraites d'Origanum glandulosum (Lamiacées)

Authors

  • Bouchikhi Tani Zoheir
  • Khelil Mohamed Anouar
  • Bendahou Mourad
  • Juli Pujade i Villar

Abstract

The essential oils extracted by hydrodistillation from the aromatic plant Origanum glandulosum (Lamiacées) were tested with various amounts on the adults of three beetles Acanthoscelides obtectus (bruchid of bean), Bruchus rufimanus, (bruchid of broad bean) and Callosobruchus maculatus (bruchid of chickpea), at a temperature of 27 ºC and a relative humidity of 75 %. These oils present an insecticidal activity and induce in the females of the three studied beetles a significant reduction of the laying compared with that in the control. The DL50 calculated after 48h of exposure, show the essential oils tested are very toxic on A. obtectus with DL 50 = 1,44 μl/ 30 g of seeds, have a little variable toxicity on C. maculatus with DL 50 = 2.06 μl/ 30 g of seeds, and less toxic on B. rufimanus with DL 50 = 7.72 μl/ 30 g of seeds. The analysis of the chemical composition shows the richness of essential oils in compounds known for their insecticidal properties like the α-pinene, limonene, carvacrol, and the thymol, which explains the results obtained.

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Published

2012-07-17

Issue

Vol. 76 : 2010-2011

Section

Regiment de la Cosa Natural

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