Abstract
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 (ri) 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−1of 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 (LC50, LC25, LC10 and LC1). The LC50 and LC95 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 ri, rate of development, oviposition, and number of eggs of C. maculatus and therefore have potential for pest control.
Highlights
Eridiane da Silva Moura[1], Lêda Rita D’ Antonino Faroni 2, José Cola Zanuncio[1], Fernanda Fernandes Heleno 2 & Lucas Henrique Figueiredo Prates 2
The experimental units consisted of 0.8 L flasks treated with concentrations of 1.2–11.2 μL L−1of 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 lethal concentrations (LC) required to kill C. maculatus adults differed between the essential oil and α-bisabolol
Summary
Eridiane da Silva Moura[1], Lêda Rita D’ Antonino Faroni 2, José Cola Zanuncio[1], Fernanda Fernandes Heleno 2 & Lucas Henrique Figueiredo Prates 2. The work evaluated the toxicity, inhibition of oviposition, instantaneous rate of population growth (ri) and the development of fumigated C. maculatus with the essential oil of Vanillosmopsis arborea and its major constituent, α-bisabolol. Callosobruchus maculatus (Fabricius, 1775) (Coleoptera: Chrysomelidae), the main cowpea insect pest[1], shows cosmopolitan habit, is found on stored legumes and its biology and ecology have been studied[2] Seed destruction by this insect is often so great that the grains become unfit for human consumption and nonviable for replanting or commercialization[2] after a few months of storage[3]. The objective was to evaluate the toxicity, oviposition inhibition, instantaneous population growth rate (ri) and the development of C. maculatus treated with fumigation using Vanillosmopsis arborea essential oil and its major component α-bisabolol
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