The Red Imported Fire Ant is a
serious economic pest in the southeastern United States. It originates in
lowlands of South America, mainly Brazil and Argentina. Since its invasion of southern California
in 1984, periodic outbreaks have occurred in several counties. State-wide eradication efforts started in
1999 but ended in 2003. However,
Vector Control Districts continue eradication efforts.
The
sting of a single Fire Ant can be painful
and field workers are
especially vulnerable. Young
livestock and poultry are also attacked and wildlife is disturbed. Foraging
ants may clog irrigation lines and short-circuit electrical systems. Quarantine procedures add to the cost of
commercial nurseries.
Fire
ants arrived in California with honeybees from Texas in 1997 and infested
almond orchards in Kern and Fresno counties. In 1998 fire ants were detected in an area covering at least 50
square miles of Orange County, leading to a quarantine of the entire
county. Dr. Mark Hoddle reports that
other outbreaks have subsequently been discovered in western Riverside county
(especially the Coachella Valley), and the counties of Los Angeles, San
Diego, Santa Barbara, and Sacramento.
Additional infested almond orchards have been found in Madera, Merced,
and Stanislaus counties. Some of
these infestations may have been present for 10 years before they were
officially detected. The ants confine
their activity to irrigated areas and have not been found in dry land areas.
Poison
baits have been used to reduce local colonies of fire ants, but they must be
continuously applied and are expensive.
These baits that were developed specifically for the fire ant also are
effective against the Argentine ant, that invades dwellings. Applications applied at ground level
around the periphery of a structure will remain effective for a month or
more. Biological control studies have
been made for natural enemies of the fire ant in South America, but there has
been no success in finding effective candidates for importation.
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