Fire ants: stopping the invasion with flies

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James Williams explains an interesting method for stopping the invasion of fire ants through one of their nastiest enemies: parasitoid flies, which literally get into their heads.  Biological control is the best hope as pesticides have not been effective against fire ants. 

Fire ants were accidentally introduced in the United States through a cargo ship from South America in 1918. One percent of the population is seriously allergic to these ants. 

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