This paper presents the unexpected winter activity of Dermacentor reticulatus (Fabricius, 1794) ticks in a newly emerging population in south-west Poland. Host-seeking ticks were collected from vegetation in January 2016 in a meadow ecosystem in six sites located in the Wroclaw Agglomeration, as well as from ten companion animals. A total of 238 questing D. reticulatus ticks, comprising 166 females and 72 males, were collected from all examined sites with the highest number of 102 specimens collected in one hour in one locality (Muchobór Wielki, Wrocław). Additionally, two fully-engorged females were collected from two dogs along with one slightly engorged female from a cat. The fact that D. reticulatus can be very active in January indicates a need to take into account the increased threat of tick-bite in the winter time.
Keywords: Dermacentor reticulatus; Poland; Ticks; Winter activity.
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