Efficiency of insecticide treated log sections (trap tipis) on the European spruce bark beetle, Ips typographus (Coleoptera, Curculionidae)

Disagreement concerning the assessment of the success of trap tipis was the reason for the comparison of various, catching devices. Significantly, more Ips typographus were caught with slit traps than with insecticide treated trap tipis. Both trap systems caught more beetles than common trap logs during the whole study (two periods: one month in spring and one month in summer). Slit traps brought evidence of similar trapping success in spring and summer insecticide treated trap tipis and trap logs were approached by 1. typographus more intensely in spring I. typographus were killed after coming in contact with the Pyrethroid sprayed bark surface of trap tipi log sections in both periods of investigation. Despite the presence of three attractive catching devices, infestation of standing trees by bark beetles (next to the test area) could not be avoided. The bark beetle predator, Thanasimus formicarius was found frequently on trap tipis and was also killed b) the insecticide coating.