[A focus of Dermacentor reticulatus kept by red and fallow deer in animal husbandry (Kosewo, Poland)].

Focus of Dermacentor reticulatus has been found on the area of fenced Cervides Farm. Very frequent occurrence of D. reticulatus on plants of red and fallow deer pens indicates that these animals in farm conditions are good hosts of adult forms of this tick. On pens of red deer the number of ticks caught on plants was considerable greater than on pens of fallow deer. However, proportion of males in spring and autumn populations of ticks caught on fallow deer pens was considerable greater than on red deer pens. Finding of adult forms of D. reticulatus in many sites in Masuria allows to ascertain that Cervides Farm in Kosewo has been established on the area of natural occurrence of this tick.