Insecticide activity of essential oils against Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae)
Keywords:
secundary metabolites, allelochemicals, botanical insecticides, NoctuidaeAbstract
The objective of this study was to evaluate the insecticidal activity of essential oils of Citrus
aurantium (Rutaceae), Citrus sinensis (Rutaceae), Piper spp. (Piperaceae); Syzygium aromaticum
(Myrteraceae); Cinnamomum zeylanicum (Lauraceae); Zingiber officinale (Zingiberaceae)
and Rosmarinus officinalis (Lamiaceae), and the majoritary component D-limonene against
Helicoverpa armigera. The extraction of essential oils was performed by hydrodistillation. 2 mL
of the essential oils at 2% concentration (v.v-1) were sprayed on first instar larvae and after
48 hours the acute toxicity of essential oils was evaluated by larvae mortality. The essential
oils of C. aurantium, C. sinensis, and the majoritary component D-limonene showed insecticidal
activity 48 hours after spraying. The essential oils of the genus Citrus spp. are potential
alternatives for the development of new technologies that can be applied in the sustainable
management of H. armigera.