28.04. Ips duplicatus (Sahlberg, 1836)
Presence
E: AU BY CT CZ EN FI FR GE HU LA LT NR NT PL SL* SK SV
A: ES FE HEI JA JIL KZ LIA MG NC NMO SCH WS XIN
Older catalogs and keys – citations of name
Grüne 1979: Ips duplicatus (Sahlberg, 1836); Freude, Harde, Lohse 1981: I. duplicatus (Sahlberg, 1836); Pfeffer & Knížek 1993: Ips duplicatus (Heer, 1836); Pfeffer 1995: I. duplicatus (Sahlberg, 1836).
Figure 118: Ips duplicatus, distribution map according to historical and recent data
Ecology and presence in Slovenia
A Eurasian species originally found in NE Europe and N Asia. Later it spread to several European countries (Germany, Poland, Czech Republic, Slovakia, Austria and Hungary) and to the European part of the former Soviet Union. In Slovenia, the species was found in 2020 in several locations in Gorenjska, mostly in the vicinity of Kranj (Figure 118). Hosts include Picea abies, P. ayanensis, P. obovata, less frequently Pinus sylvestris, P. cembra, P. sibirica, Abies spp. and Pseudotsuga menziesii. In Slovenia, all individuals were caught in traps with pheromones for I. duplicatus or I. typographus. The species usually occurs together with other bark beetles and its phenology is similar to that of I. typographus. It usually develops two, and in favourable conditions up to four, generations per year. The tunnel system is elongated, with 1-4 maternal galleries. At 2.8-4.0 mm it is shorter than I. typographus and usually darker in colour. Of the four denticles at the tip of the elytrum, the 2nd and 3rd denticles grow from a common base, with a smaller distance between them than between the first (sutural) and second denticle. I. duplicatus attacks mainly the higher parts of trunks and thicker branches, but rarely fallen trees. Its population density is relatively low in Slovenia, but localized increased reproduction may occur in the future. Pheromone: Ipsdienol (Bakke 1975).