Culiseta annulata overwinters in its adult stage. In Northern Europe, females of this species are found in caves from autumn to early spring together with females of genus
Culex (
Culex pipiens,
Culex torrentium, and
Culex territans). In the
Czech Republic the most frequent animals bitten by it are
european fallow deer and
red deer, however it also bites humans,
sheep, other deer and
pigs. On 16 October 2025 it became the first mosquito species with both male and females identified in
Iceland.
Vector potential Japanese encephalitis virus RNA has been detected in its saliva and it is a competent if inefficient vector of
Tahyna virus. ==References==