Chemoecology

, Volume 19, Issue 1, pp 29–36 | Cite as

Female sex pheromones in the host races and hybrids of the fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae)

Research Paper

Abstract

The three major pheromone components found in gland extracts of both rice and corn strain Spodoptera frugiperda virgin females were Z9-14:Ac, Z11-16:Ac and Z7-12:Ac, However, both the concentrations and relative proportions of the compounds varied significantly between strains as a function of female age and the time during the scotophase that the glands were extracted. The concentration of Z9-14:Ac found in the glands of hybrid females, coming from corn × rice and rice × corn crosses differed significantly, but in both cases did not differ significantly from that of maternal line females. The results suggest that synthesis is controlled, at least in part, by the W chromosome. Given the intraspecific variability reported in other species of Lepidoptera, both with respect to female pheromone production and male responsiveness, it would appear rather unlikely that these differences alone would be sufficient to ensure reproductive isolation of the two strains.

Keywords

Fall armyworm Host races Pheromone titers Hybrids Reproductive isolation 

Notes

Acknowledgments

We would like to thank J. Gobeil, A. Labrecque and N. Lima for their assistance in the insect rearing and observations of calling females. This research was funded by a NSERC discover grant to JNM and EL was supported by a scholarship from CNPq.

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Copyright information

© Birkhäuser Verlag, Basel/Switzerland 2009

Authors and Affiliations

  1. 1.Departamento de Biologia Animal, EntomologiaUniversidade Federal de ViçosaViçosaBrazil
  2. 2.The Department of BiologyThe University of Western OntarioLondonCanada

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