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The lack of effective methods of forest protection against bark beetles in Norway spruce stands was the reason for undertaking the studies aimed at the assessment of efficacy of pheromone traps Trinet P that act as an ‘attract and kill' system to reduce the population of spruce bark beetle Ips typographus (Col.: Curculionidae: Scolytinae). The Trinet P trap consists of a triangular stand, on which the net containing alpha−cypermethrin is stretched. Each trap is baited by the synthetic pheromone attracting I. typographus beetles, which fly towards the trap and die due to the contact with the net coated with insecticide. The experiments were conducted in 2011−2012 on 6 experimental plots located in 26−82−years−old Norway spruce stands in Beskid Sądecki Mts. (southern Poland) that were threatened with the bark beetles. The experimental plot consisted of 100 m long stand edge exposed to bark beetle attack, with set of 5 traps installed in line. Similar stand edges without traps were used as control. The experiments were assumed before the I. typographus swarming, i.e. at the turn of April and May of each year. The treatment efficacy was estimated after 5 months by counting infested trees on plots with treatment and control variants. In the most cases the protective effect expressed by significantly lower number of infested trees on the edges with Trinet P traps. The symptoms of infestation by I. typographus were found up to 20% of trees in the stands protected with the Trinet P traps, while more than 80% of trees were attacked by the spruce bark beetle on the control plots. Despite these differences, the infestation density of trees in the stands protected and unprotected with traps was similar. No effect on non−target organisms was observed. The effectiveness of Trinet P traps is similar as of commonly used pheromone traps, thus this novel device can be used for the protection of Norway spruce stands against I. typographus.
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