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His specialty is the behavior and ecology of fire ants. He is currently evaluating and releasing phorid decapitating flies as fire ant biocontrol agents in the United States. He discovered that these parasites decapitate fire ant workers and then pupate in their heads. He also found that the impact of these flies on fire ant populations has been sufficient to cause the evolution of several phorid-specific defense behaviors. In 1996, he spent seven months on an ARS fellowship in Brazil studying these flies and developing ways to rear them in the laboratory.
As a result of these studies, he received approval for field release for the first species of decapitating fly Pseudacteon tricuspis in the summer of 1997. These flies have been released at more than 100 sites in 12 states with the help of USDA-APHIS and associates across the Southeast. By the fall of 2008, this fire ant biocontrol agent was estimated to occupy more than 270,000 square miles or about 50% of the fire ant range in the United States. A second species of decapitating fly, Pseudacteon curvatus, was released in the United States beginning in 2000. This species has been released at more than 60 sites in 11 states and estimated to occupy almost 320,000 square miles or about 60% of the fire ant range. The establishment of a third species, Pseudacteon litoralis, has recently been confirmed in Alabama. A fourth species, Pseudateon obtusus is well established around Gainesville, FL and several sites in Texas. A fifth species, Pseudacteon cultellatus, is being reared and evaluated in quarantine for possible release.
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Invasive Alien Speciespp.275-288, (2021)
EDISno. 3 (2020)
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