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<p>Maize, an important global crop, is threatened by herbivores, like the <i>Spodoptera frugiperda</i> larvae. Research in Brazil showed that <i>Crotalaria</i> sp. is an effective border crop to manage <i>S. frugiperda</i> infestations in maize field. However, the mechanism underlaying this effect remain unclear. This study investigated whether <i>S. frugiperda</i> oviposits on uninfested <i>Crotalaria spectabilis</i> plants and whether volatiles (HIPVs) emitted by <i>C. spectabilis</i> influence <i>S. frugiperda</i> behaviour, comparing these responses to those observed on maize plants. The results showed that females of <i>S. frugiperda</i> have a clear preference for egg-laying on uninfested maize plants over <i>C. spectabilis</i>. Blend of herbivore-induced plant volatiles (HIPVs) emitted by larvae-infested <i>C. spectabilis</i> was different the blend of HIPVs emitted by larvae-infested maize plants. Electroantennography (EAG) analysis revealed that <i>S. frugiperda</i> antennae respond to 12 volatiles emitted by maize, six of which were also present in the VOC blend of <i>C. spectabilis</i>. Wind tunnel bioassays showed that a synthetic blend of EAG-active HIPVs from maize attracted mated <i>S. frugiperda</i> females, whereas the blend containing EAG-active HIPVs from <i>C. spectabilis</i> did not elicit any behavioural response. These findings indicate that despite <i>S. frugiperda</i> being a generalist insect able of feeding and ovipositing on a wide range of plant species, they can recognize the most suitable host for their offspring using volatiles from host plants. The volatiles emitted by <i>C. spectabilis</i> do not influence the behavioural response of <i>S. frugiperda</i> females, indicating that this plant will not attract the <i>S. frugiperda</i> females when used as companion plants in maize areas.</p>

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Impact of Crotalaria spectabilis and Zea mays volatiles on Spodoptera frugiperda behaviour: implications for sustainable maize pest management using companion plants

  • 期刊论文

  • 发表日期：

    2025年9月22日

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  • Bruna Sartório de Castro,
  • Mauro Vicentini Correia,
  • Mirian Fernandes Furtado Michereff,
  • Raúl Alberto Laumann,
  • Miguel Borges,
  • Maria Carolina Blassioli-Moraes

摘要

Maize, an important global crop, is threatened by herbivores, like the Spodoptera frugiperda larvae. Research in Brazil showed that Crotalaria sp. is an effective border crop to manage S. frugiperda infestations in maize field. However, the mechanism underlaying this effect remain unclear. This study investigated whether S. frugiperda oviposits on uninfested Crotalaria spectabilis plants and whether volatiles (HIPVs) emitted by C. spectabilis influence S. frugiperda behaviour, comparing these responses to those observed on maize plants. The results showed that females of S. frugiperda have a clear preference for egg-laying on uninfested maize plants over C. spectabilis. Blend of herbivore-induced plant volatiles (HIPVs) emitted by larvae-infested C. spectabilis was different the blend of HIPVs emitted by larvae-infested maize plants. Electroantennography (EAG) analysis revealed that S. frugiperda antennae respond to 12 volatiles emitted by maize, six of which were also present in the VOC blend of C. spectabilis. Wind tunnel bioassays showed that a synthetic blend of EAG-active HIPVs from maize attracted mated S. frugiperda females, whereas the blend containing EAG-active HIPVs from C. spectabilis did not elicit any behavioural response. These findings indicate that despite S. frugiperda being a generalist insect able of feeding and ovipositing on a wide range of plant species, they can recognize the most suitable host for their offspring using volatiles from host plants. The volatiles emitted by C. spectabilis do not influence the behavioural response of S. frugiperda females, indicating that this plant will not attract the S. frugiperda females when used as companion plants in maize areas.