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<p><i>Rhyssomatus nigerrimus</i> (Coleoptera: Curculionidae) is considered an economically important pest of soybean cultivation in Mexico and is attracted by floral odour of soybean. <i>R. nigerrimus</i> has been observed in some inflorescences of alternative host plants that serve as refuge and food when the soybean plant is not seasonally available. The aim of this study was to determine which volatiles emitted by inflorescences of <i>Hamelia rovirosae</i> and <i>Lantana camara</i>, alternative host plants of the weevil, mediate the attraction of <i>R. nigerrimus</i>. We collected the volatiles from both inflorescences by dynamic aeration and analyzed them with gas chromatography coupled to mass spectrometry, performed behavioral bioassays in a Y-shaped olfactometer, and performed electroantennographic measurements. We identified monoterpenes, sesquiterpenes and fatty acid derivatives (ketones, alcohols) in the two species, with <i>α</i>-pinene, <i>β</i>-caryophyllene and 2-ethyl-1-hexanol being most abundant in <i>H. rovirosae,</i> and <i>α</i>-pinene, <i>β</i>-caryophyllene and <i>α</i>-copaene being most abundant in <i>L. camara</i>. The volatiles from the inflorescences, individual compounds and a blend of synthetic compounds elicited antennal and attraction responses in male and female weevils. Males were attracted by <i>α</i>-copaene, <i>α</i>-pinene, <i>β</i>-caryophyllene and linalool, while females by <i>α</i>-copaene, <i>α</i>-pinene, <i>β</i>-caryophyllene, linalool, (<i>E</i>)-<i>β</i>-ocimene and (<i>Z</i>)-linalool oxide furanoid. Overall, this study identified compounds used by <i>R. nigerrimus</i> to find alternative hosts. They might be useful for the management of this pest species.</p>

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Olfactory responses of the soybean weevil Rhyssomatus nigerrimus to the scent of alternate host inflorescences

  • 期刊论文

  • 发表日期：

    2025年6月24日

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  • Mónica González-Domínguez,
  • Guillermo López-Guillén,
  • Leopoldo Cruz-López

摘要

Rhyssomatus nigerrimus (Coleoptera: Curculionidae) is considered an economically important pest of soybean cultivation in Mexico and is attracted by floral odour of soybean. R. nigerrimus has been observed in some inflorescences of alternative host plants that serve as refuge and food when the soybean plant is not seasonally available. The aim of this study was to determine which volatiles emitted by inflorescences of Hamelia rovirosae and Lantana camara, alternative host plants of the weevil, mediate the attraction of R. nigerrimus. We collected the volatiles from both inflorescences by dynamic aeration and analyzed them with gas chromatography coupled to mass spectrometry, performed behavioral bioassays in a Y-shaped olfactometer, and performed electroantennographic measurements. We identified monoterpenes, sesquiterpenes and fatty acid derivatives (ketones, alcohols) in the two species, with α-pinene, β-caryophyllene and 2-ethyl-1-hexanol being most abundant in H. rovirosae, and α-pinene, β-caryophyllene and α-copaene being most abundant in L. camara. The volatiles from the inflorescences, individual compounds and a blend of synthetic compounds elicited antennal and attraction responses in male and female weevils. Males were attracted by α-copaene, α-pinene, β-caryophyllene and linalool, while females by α-copaene, α-pinene, β-caryophyllene, linalool, (E)-β-ocimene and (Z)-linalool oxide furanoid. Overall, this study identified compounds used by R. nigerrimus to find alternative hosts. They might be useful for the management of this pest species.