The community of bark-inhabiting beetles (Coleoptera) on Norway spruce (Picea excelsa Link).
A new method of monitoring association of bark-inhabiting beetles in stands of Norway spruce (Picea excelsa [P. abies]) that was developed in Czechoslovakia is described. It is based on the use of barriers on the ground and in tree crowns, and flying insects are trapped continuously in forest stands throughout the growing season. Between 1978 and 1984, the barriers trapped 61 phytophagous and 31 predatory species, as compared with 11 phytophages and 5 predators caught by trap trees. Different species were recorded in different parts of standing and lying trunks, in stumps and in slow-growing trees. The species whose development takes place in the sapwood and whose dominance is greater than 10% are of particular importance and should be controlled by means of trap trees or pheromone traps; these species include Ips typographus, Pityogenes chalcographus, I. amitinus and Tetropium spp.