Mosquitoes during the winter?
With many adult mosquito populations becoming less active as the rains set in, it may seem like mosquitoes are not a problem in Alameda County during the winter months. However, our temperate climate allows a few species, such as
Culiseta incidens (a mosquito which develops in relatively clean water), to remain active year round. On the other hand, several species native to our county are primarily found during the winter months.
Culiseta inornata is a large mosquito with females that actively bite throughout the winter. As such, this mosquito can currently be found in all stages of its life cycle. Eggs of
Aedes sierrensis,
Aedes squamiger, and
Aedes washinoi (all native
Aedes mosquito species) begin to hatch as rainwater fills up marshes, heavily vegetated depressions, and tree holes. Larvae of these mosquito species are currently developing and adults will begin to emerge as spring approaches. Since mosquitoes can be found year round in Alameda County, it is important to continue to drain or cover any standing water. After a rain event is a great time to walk through your yard and search for areas with standing water. If you need help knowing where to look, our
backyard checklist is a great place to start.
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