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Fly Release Is Latest Step in Fire Ant Biocontrol StrategyBy Tara Weaver
July 8, 1997
GAINESVILLE, Fla., July 9--A Brazilian fly that dive-bombs fire ants will be released here today as part of a new, environmentally friendly strategy to use natural enemies to control the ants that now infest millions of acres in the southern United States.
Scientists with the Agricultural Research Service--the U.S. Department of Agricultures chief scientific agency--will release several thousand phorid flies and parasitized ants at Gainesvilles Kanapaha Gardens. Florida officials and USDAs Animal and Plant Health Inspection Service have approved the release. The fly attacks only fire ants and poses no threat to any other insects, wildlife or humans.In these field tests, we want to demonstrate that these flies can help reduce fire ant populations, said Sanford Porter, an ARS entomologist in Gainesville. The flies are effective in our quarantine laboratory, but we want to see how well they do in outdoor conditions.
Porter spent six months last year in Brazil studying the flies and fire ants in their native country. Known for their burning sting, fire ants are thought to have spread to the United States via contaminated ships from South America early in the 1930s. The ants now infest an estimated 278 million acres in 11 southern states and Puerto Rico. They have flourished in the United States because they have no natural enemies here.
Porter has been studying the parasitic flies under quarantine in Gainesville since 1994. The flies zero in on fire ants and pierce the pests outer cuticle, then deposit an egg inside the ant. The egg eventually develops into a larva inside the ant, moves into the ants head and causes the ants head to fall off. The fly completes its development inside the fallen head.
The fly is one of several biological controls for fire ants now under study at ARS Center for Medical, Agricultural and Veterinary Entomology in Gainesville, according to David Williams. He is the lead scientist on the centers fire ant biological control research. Williams said two other possible biocontrols are:
Porter and Williams said theyre optimistic that the release of phorid flies and other natural enemies will eventually tip the ecological balance against fire ants in the United States and reduce their high populations here.
Scientific contact: Sanford D. Porter, Imported Fire Ant and Household Insects Research Unit, Agricultural Research Service, USDA, Gainesville, Fla. 14565. Telephone: (352) 374-5914, fax (352) 374-5818 firstname.lastname@example.org.