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Vigna unguiculata , one of the most important legumes, mainly in underdeveloped countries, is susceptible to post-harvest losses in storage by  Callosobruchus maculatus  (Fabricius, 1775) (Coleoptera: Chrysomelidae). The work evaluated the toxicity, inhibition of oviposition, instantaneous rate of population growth (r i ) and the development of fumigated  C. maculatus  with the essential oil of  Vanillosmopsis arborea  and its major constituent,  α -bisabolol. The experimental units consisted of 0.8 L flasks treated with concentrations of 1.2–11.2 μL L −1  of air  of the essential oil of  V. arborea  or its major constituent applied to disks of filter paper.  α -Bisabolol was quantified as 409.33 mL L −1  of the essential oil. The development rate of  C. maculatus  was evaluated by daily adult counts. Oviposition was evaluated at lethal concentrations (LC 50 , LC 25 , LC 10  and LC 1 ). The LC 50  and LC 95  of the essential oil of  V. arborea  and  α -bisabolol were 5.23 and 12.97 μL L −1  of air and 2.47 and 8.82 μL L −1  of air, respectively. At some concentrations, the  α -bisabolol was more toxic to males than to females of the insect. Increased concentrations of the essential oil reduced the r i , rate of development, oviposition, and number of eggs of  C. maculatus  and therefore have potential for pest control.

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Insecticidal activity of Vanillosmopsis arborea essential oil and of its major constituent α-bisabolol against Callosobruchus maculatus (Coleoptera: Chrysomelidae)