EFFECTS OF BAITED PITFALL TRAPS (HYLOBIUS-ABIETIS L) ON NONTARGET FOREST INSECTS

The use of baited pitfall traps for control and prognosis was found to have significant adverse effects on many non-targets (in Czechoslovakia). Most of the non-targets were carabid species inhabiting the forest floor, and some corticolous beetles (scolytids). These and other species are reviewed. However, the traps can be highly selective, which depends on the size of lateral holes that must only slightly exceed the body diameter of H. abietis. None of the natural enemies of H. abietis were trapped. A review of measures preventing the adverse trap action in the Integrated Pest Management (IPM) of H. abietis is added. There is no information on the (adverse) side-effects of the traps in spite of their broad utilisation in the Scandinavian countries, the U.S.A. and Canada.