The map shows the spread of Africanized honey bees (AHB) by county by year.
AHBs have continued their slow territorial expansion in the southern United States, and have now been confirmed in nine states. The map lists a county only when that state officially declares it to be Africanized.
There are discontinuities in the spread, especially between Louisiana and Florida where AHB spread is likely a result of human-assisted transportsuch as AHB swarms hitchhiking on trucks, railroad cars, ships or airplanes.
Human-assisted transported AHBs are not considered a territorial spread unless the honey bees become established beyond the original swarm find.
ARS updates the AHB map about every six months.
The ARS Carl Hayden Bee Research Center in Tucson, Ariz., is responsible for official identifications of Africanized honey bees, especially when the honey bees are found in new states.
ARS is the U.S. Department of Agriculture's chief scientific research agency.