Untersuchungen zur Fangleistung von Schlitzfallen und Fangholzhaufen bei der lokalen Dichteabsenkung von Buchdrucker (Ips typographus)-Populationen

Two kinds of pheromone-based trap systems are used in the integrated system against the European Spruce Bark Beetle: a standardized commercial slot-trap and an attract-and-kill system using insecticide-coated spruce wood. To determine the individual benefits and limits in both systems, a comparative survey has been done in 2008, respecting the slightly different requirements for deploying both systems with maximum efficiency. The observed results showed that both systems are able to attract large numbers of spruce bark beetles, however the wooden attract-and-kill system removed both larger numbers and higher percentages of the attracted individual beetles. During the survey, the wood traps were able to incapacitate between 80 and 90?% of the attracted beetles, while the slot-traps kept only 50?C60?% contained. While the use of a non-specific insecticide in a freely accessible trap system always bears the risk of attracting and killing individuals of non-targeted species, the survey gave no indication that specialised antagonists of the spruce bark beetle or other non-target-species has been overly affected. The percentage of non-target-organisms has been 0.3?% in total. It was concluded that, while both systems have the capability to reduce the local population of European Spruce Bark Beetles, the natural wood trap system using an insecticide has the ability to control a much larger population and should therefore be considered the primary choice if the conditions on the site indicating a high risk of a continuous bark beetle infestation.