Contribution to the knowledge of wood-wasps (Hymenoptera, Siricidae) from some localities in Serbia.
During studies carried out in Serbia, Yugoslavia, between 1972 and 1975 on the fauna of Siricidae infesting coniferous trees, the species Urocerus gigas (L.), U. augur (Klug), U. fantoma (F.), Sirex juvencus L., S. noctilio F. and Xeris spectrum (L.) were found. Of these species, 5 attacked fir, 4 attacked spruce and 2 attacked pine. The species appeared at the end of May, and adult flight lasted until the first half of November at the lowest air temperature (approximately 19 deg C). All parts of the tree were inhabited by X. spectrum, S. juvencus and U. gigas, while the lower parts were inhabited by U. augur, U. fantoma and S. noctilio. The most frequently observed species were U. gigas and X. spectrum. The duration of the life-cycle was 3-4 years for all species except the small form of U. gigas, which lived mostly in branches and had 2-year generations. Larvae of U. gigas were found to feed on hyphae of the fungus species Ungulina annosus and Armillariella mellea. Only 2 parasites of the siricids were recorded (Rhyssa persuasoria (L.) and Ibalia leucospoides (Hochenw.)).