Florida Entomologist (2003) 86, 334-339

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L.C. 'Fudd' Graham, Sanford D. Porter, Roberto M. Pereira, Henry D. Dorough and Amber T. Kelley (2003)
Field releases of the decapitating fly Pseudacteon curvatus (Diptera: Phoridae) for control of imported fire ants (Hymenoptera: Formicidae) in Alabama, Florida, and Tennessee
Florida Entomologist 86 (3), 334-339
Abstract: The little decapitating fly, Pseudacteon curvatus Borgmeier, was released at 11 sites in Alabama, Florida, and Tennessee as a potential self-sustaining biocontrol agent of imported fire ants. We used a biotype from Buenos Aires Province, Argentina that parasitizes black fire ants (Solenopsis richteri Forel). Generally, several thousand flies were released as larvae in parasitized ant workers over a 1-2 week period. Pseudacteon curvatus flies were successfully established on hybrid fire ants (Solenopsis invicta X Solenopsis richteri) at a site near Talladega, Alabama where they have persisted more than two years and expanded out 5-20 km from the original release site. Flies failed to establish in Florida and Tennessee although a few 1st-generation field-reared flies were recovered at four sites in Florida. This fly is only the second parasitoid species to be successfully released against imported fire ants or any other pest ant species. Possible reasons for failures at the other sites include insufficient vegetation cover, competition with another Pseudacteon species in Florida, severe winter kill of ants at a site in Tennessee, and the possibility that the biotype of P. curvatus released was not a viable parasitoid of red imported fire ants.

La mosca pequeña decapitadora Pseudacteon curvatus Borgmeier fue liberada en 11 sitios en Alabama, Florida y Tennessee como un agente auto-sostenible de control biológico de la hormigas de fuego importadas. Usamos un biotipo de la Provincia de Buenos Aires, Argentina que parasita las hormigas negras de fuego (Solenopsis richteri Forel). Generalmente, varios miles de moscas fueron liberadas como larvas dentro de las hormigas trabajadoras en un periodo de 1-2 semanas. Las moscas Pseudacteon curvatus fueron exitosamente establecidas sobre unas hormigas de fuego híbridas (Solenopsis invicta X Solenopsis richteri) en un sitio cerca de Talladega, Alabama en donde persistieron por más de dos años y se expandierón 12 km del sitio original donde fueron liberadas. Aunque hormigas de la primera generación criadas en el campo fueron colectadas en cuatro sitios en Florida, las moscas no pudieron establecerse en Florida y Tennessee. Esta mosca es solamente el segundo parasitoide de uso en control biológico que há sido exitosamente liberado para el control de las hormigas importadas de fuego o cualquier otra especie de hormiga. Posibles razones por el fallo en otros sitios incluye insuficiente cubrimiento de vegetación, competición con otras especies de Pseudacteon en Florida, una muerte severa invernal de las hormigas en un sitio en Tennessee, y la posibilidad de que el biotipo de P. curvatus que fue liberado no es un parasitoide viable de las hormigas rojas de fuego importadas.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Full text of article
Database assignments for author(s): Roberto M. Pereira, Sanford D. Porter

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
classical biocontrol/new introduction
population dynamics/epizootiology


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Solenopsis richteri U.S.A. (SE)
Pseudacteon curvatus (parasitoid) Solenopsis richteri U.S.A. (SE)