| Autor: |
Plata-Rueda, Angelica1 angelicaplata@yahoo.com.mx, Campos, Juliana Mendonça2 mendonca.campos@yahoo.com.br, da Silva Rolim, Gabriela2 gabrielasrolim@gmail.com, Martínez, Luis Carlos3 lc.martinez@outlook.com, Dos Santos, Marcelo Henrique4 marceloh.santos@ufv.br, Fernandes, Flávio Lemes1 flaviofernandes@ufv.br, Serrão, José Eduardo3 jeserrao@ufv.br, Zanuncio, José Cola5 zanuncio@ufv.br |
| Abstrakt: |
This study evaluated toxic effects, repellency and respiration rate caused by terpenoid constituents of cinnamon and clove essential oils and against Sitophilus granarius L. (Coleoptera: Curculionidae). The lethal concentrations (LC 50 and LC 90 ), repellent effect, and behavior repellency response on adults of S. granarius after exposure to six concentrations of each essential oil and terpenoids were evaluated. The chemical composition of the cinnamon oil was also determined and primary compounds were eugenol (10.5%), trans-3-caren-2-ol (10.2%), benzyl benzoate (9.99%), caryophyllene (9.34%), eugenyl acetate (7.71%), α-phellandrene (7.41%), and α-pinene (7.14%). In clove essential oil, the primary compounds were eugenol (27.1%), caryophyllene (24.5%), caryophyllene oxide (18.3%), 2-propenoic acid (12.2%), α-humulene (10.8%), γ-cadinene (5.01%), and humulene oxide (4.84%). Cinnamon and clove essential oil was toxic to S. granarius . In toxic terpenoids compounds, eugenol has stronger contact toxicity in S. granarius than caryophyllene oxide, followed by α-pinene, α-humulene, and α-phellandrene. Insects reduced their respiratory rates after being exposed to essential oil terpenoids and avoided or reduced their mobility on terpenoid-treated surfaces. Cinnamon and clove essential oil, and their terpenoid constituents were toxic and repellent to adult S. granarius and, therefore, have the potential to prevent or retard the development of insecticide resistance. [ABSTRACT FROM AUTHOR] |
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