DISPERSAL OF THE SPRUCE BARK BEETLE IPS-TYPOGRAPHUS (L) (COL, SCOLYTIDAE) IN SPRUCE WOODS

The dispersal of marked Ips typographus (L.) was tested by using pheromone traps placed at various distances in spruce woods in a model area in southern Bohemia, Czechoslovakia in 1989 and 1990. In 1989, 27.1 % of the released marked beetles were captured, and 16.0 % in 1990. In both years, most of the beetles were caught within 200 m of the place of release (11.1 % in 1989 and 10.6 % in 1990) and the numbers of captured beetles decreased with increasing distance. Only 2.8 % of the released I. typographus were caught at a distance of 1000 m in 1989 and 3.4 % in 1990.