Can low concentration flufenoxuron treatment increase the pathogenicity or production of nucleopolyhedrovirus occlusion bodies in Spodoptera exigua (Hübner) or Spodoptera frugiperda (JE Smith) (Lepidoptera: Noctuidae)?




Palabras clave:

Regulador de crecimiento de insectos, matriz peritrófica, insecticida biológico, cuerpos de oclusión, Baculoviridae


Nucleopolyhedroviruses (Baculoviridae) are lethal pathogens that naturally infect lepidopteran larvae. The chitin synthesis inhibitor flufenoxuron has been reported to potentiate the insecticidal properties of nucleopolyhedrovirus occlusion bodies (OBs) by degrading the integrity of the peritrophic matrix in lepidopteran larvae. In the present study we examined the effect of flufenoxuron treatment on susceptibility of Spodoptera exigua (Hübner) and Spodoptera frugiperda (JE Smith) fifth instars to their homologous nucleopolyhedroviruses, SeMNPV and SfMNPV, respectively. Preliminary bioassays indicated that a 1 mg/l concentration of flufenoxuron resulted in 6.6 - 13.3% mortality of larvae, which could be used in combination with OB inoculum concentrations of 1.5 × 104 OBs/ml of SeMNPV OBs or 1.3 × 10⁶ OBs/ml of SfMNPV OBs. Treatment of larvae with flufenoxuron did not significantly affect virus-induced mortality of either S. exigua (16.7 - 17.2%) or S. frugiperda (28.9 - 34.4%) and had no significant effect on the mean yield of OBs from virus-killed insects of either species. The identity of both SeMNPV and SfMNPV in experimental insects was confirmed by examination of the restriction endonuclease profiles of each virus. These findings contrast with the results of previous studies in which high concentrations of flufenoxuron (100 mg/l) greatly potentiated virus-induced mortality in the silkworm Bombyx mori L., although insect mortality due to flufenoxuron treatment alone was not reported, for reasons that are unclear. We conclude that flufenoxuron (1 mg/l) failed to potentiate the insecticidal activity of SeMNPV or SfMNPV in their respective hosts. 


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Biografía del autor/a

Trevor Williams,

Instituto de Ecología, A.C., Xalapa

  • Licenciatura:  (1985) University of Bath, Gran Bretaña. B.Sc. (Honores) en Biología Aplicada
  • Doctorado: (1989) Imperial College (Silwood Park), Universidad de Londres. Ph.D. Ecología de Insectos. Supervisor: Dr. J.K. Waage. Título de la tesis: "Sex ratio strategies in the facultatively autoparasitic wasp, Encarsia tricolor".
    • 1989-1990. ICI Agrochemicals (Zeneca), Jealotts Hill, Gran Bretaña. Investigador: Efectos de la recombinación sobre la actividad insecticida de Bacillus thuringiensis, para el control de plagas del algodonero.
    • 1990 - 1994. NERC Institute of Virology and Environmental Microbiology, Oxford, Gran Bretaña. Investigador Posdoctoral: Ecología de los virus patógenos de insectos.
    • 1994 - 2007. Investigador Titular "D". Departamento de Entomología. El Colegio de la Frontera Sur (ECOSUR), Unidad Tapachula, Chiapas. Responsable del proyecto de investigación: Ecología de Enemigos Naturales de Insectos Plaga.
    • 2007 - presente. Investigador Titular "D". Instituto de Ecología A.C., Xalapa, Veracruz.



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Cómo citar

Pressa-Parra, E., Navarro-de-la-Fuente, L., Williams, T., & Lasa, R. (2023). Can low concentration flufenoxuron treatment increase the pathogenicity or production of nucleopolyhedrovirus occlusion bodies in Spodoptera exigua (Hübner) or Spodoptera frugiperda (JE Smith) (Lepidoptera: Noctuidae)? (English). ACTA ZOOLÓGICA MEXICANA (N.S.), 39(1), 1–15.
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