29.05. Orthotomicus suturalis (Gyllenhal, 1827)
Presence
E: AB AU BE BH BU BY CT CZ DE EN FI FR GB GE GR HU ICi IT LA LT MC MD NL NR NT PL PT RO SC SK SL SP ST SV SZ UK YU
A: ES FE JA JIL KZ LIA MG NC QIN SC SCH SHA SHX YUN TR WS
Figure 130: Orthotomicus suturalis, dorsal, lateral (Photo: Maja Jurc)
Older catalogs and keys – citations of name
Grüne 1979: Orthotomicus suturalis Gyllenhal, 1827; Freude, Harde, Lohse 1981: O. suturalis Gyllenhal; Titovšek 1988: O. suturalis (Gyllenhal); Pfeffer & Knížek 1993: O. suturalis (Gyllenhal, 1827); Pfeffer 1995: O. suturalis (Gyllenhal, 1827).
Figure 131: Orthotomicus suturalis, distribution map according to historical and recent data
Ecology and presence in Slovenia
The species is distributed in Europe, Asia Minor, the Caucasus, Siberia, Mongolia, northern China and Japan. O. suturalis is found in Primorska, Gorenjska, Dolenjska and Štajerska (Figure 131). Hosts: mainly Pinus sylvestris, P. thunbergiana, P. sibirica, P. densiflora, P. koraiensis, P. nigra, P. pumila, Pinus spp., Picea abies, P. glehnii, P. jezoensis, P. orientalis, P. obovata, rarely Picea spp., Larix decidua, Abies alba, A. nordmanniana. In Slovene territory, the species has been found on P. sylvestris, P. nigra and P. abies. O. suturalis is a thin-bark species that inhabits young, wilting trunks. It develops 1-2 generations per year, swarming in May, July and August. It builds irregular star-shaped straight systems with 2-5 maternal tunnels. Most of the tunnel system is in the bark, with only the pupation chambers at the end of the larval passages shallowly burrowing into the sapwood. Adult length is 2.5-3.5 mm. The distance between the sutural denticles is greater than between the sutural denticle and the 2nd denticle at the tip of the apex (Figure 130). The species is distinctly secondary.