SELECTIVITY OF SYNTHETIC AGGREGATION PHEROMONES LINOPRAX(R) AND PHEROPRAX(R) IN THE CONTROL OF THE BARK BEETLES (COLEOPTERA, SCOLYTIDAE) INA TIMBER STORAGE YARD

The selectivity of the synthetic aggregation pheromones Linoprax(R) an d Pheroprax(R) in black flight barrier traps of the Theysohn type was determined by the response of the lineate bark beetle Trypodendron lin eatum (Ol.), the eight-toothed spruce bark beetle Ips typographus (L.) , and other insects at the timber storage yard of a woodprocessing ind ustry in Ljubljana, Slovenia. The information obtained can be used in establishing a pheromone-based mass-trapping program for bark beetles in the timber storage yard. A total of 24 349 insects were captured in Linoprax baited traps, 78.5% of them belonged to T. lineatum, 19.9% t o I. typographus while 1.6% of them were other insects. A total of 22 815 insects were caught on traps baited with Pheroprax, 92.8% of them were I. typographus, 5.8% of them belonged to T. lineatum and 1.4% wer e represented by other insects. On the control unbaited traps, 3 429 b eetles were caught, 52.5% of them belonged to I. typographus, 38.4% we re T. lineatum and 10.1% were other insects. Spatial and temporal dist ribution patterns for T. lineatum and I. typographus were identified. The air temperature and the locations of the Theysohn traps affected t he catch. The ecological meaning of selectivity of synthetic pheromone s is discussed.