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Items of Interest |
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Mosquito Information
People should be aware of
the different types of mosquitoes and which ones are most likely to carry West
Nile virus. Mosquito abatement programs focus on those species of mosquitoes
that cause disease.
Permanent (Stagnant) Water Mosquitoes
are the most important vector for West Nile Virus.
- These are
found in places that hold water for long periods of time, such
as stagnant ponds and abandoned green swimming pools. They are
seldom seen in the daytime, when they rest in shrubbery and
other cool sheltered places. They are active and biting during
nighttime hours, indoors and outdoors. Even though they are at
rest during daytime, they will rise up and bite if disturbed.
- Common
types of permanent water mosquitoes found in Pinal County
include:
-
Culex tarsalis
- This is the most important mosquito of
arboviruses in western North
America. Larval habitat is usually among surface
water pools that are frequently surrounded by
grasses and annual vegetation and agricultural
tail water
-
Culex quinquefasciatus - The
southern house mosquito is found throughout the
southern half of the United States. This
mosquito prefers to lay eggs in small pools of
water, and can utilize water that is polluted
with organic material
Floodwater
(Intermittent Water) Mosquitoes are a nuisance
mosquito. They are rarely infected with West Nile Virus and they are not deemed
a public health threat.
- Floodwater
mosquitoes typically appear (sometimes in significant numbers) a
couple of days after rains and flooding.
- Monsoon rains
and flood irrigation contribute to the floodwater mosquito
population.
- Common
types of floodwater mosquitoes found in Pinal County include:
-
Psorophora columbiae
- The females are furious biters in day or
night. Females lay their eggs on damp soil in
depressions subject to flooding by rainfall. The
larval period is relatively short, usually
requiring 3 to 5 days. This mosquito can be
found in areas with flat sheets water, usually 3
to 6 inches deep. Psorophora columbiae prefers
habitats with direct sunlight. She can be found
in pastures, lawns, golf courses and open
fields.
-
Aedes vexans
- Virtually any transient water can support
Aedes vexans larvae, but rain pools in un-shaded
areas produce the largest broods. The species is
most common in grassy pools that border trees or
shrubs. In most cases, floodwater habitats will
be dominated by this abundant mid-season
mosquito
More information on
mosquitoes in Arizona can be found at:
Arizona Mosquito Information
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