Abstract

In the fall of 2005 and the spring of 2006, the fire ant decapitating fly Pseudacteon tricuspis (Diptera: Phoridae) was observed 145-275 km out from the original release sites in northern Florida, occupying an area of about 86,500 km2. Average expansion rates of 26-57 km/year were considerably faster than previous observations. Considering these rates and other releases, we estimate that almost all of the state of Florida will harbor resident populations of P. tricuspis in the next 3 to 5 years.

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