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Bark beetles and their predators in bark beetle pheromone traps

, : Bark beetles and their predators in bark beetle pheromone traps. Zoologische Jahrbuecher Abteilung fuer Systematik Oekologie und Geographie der Tiere 119(2): 315-338

The arthropod fauna caught by different types of bark beetle traps was investigated during the vegetative period 1988 and 1989 using pheromone baited traps and controls. The proportion of Scolytidae caught by the traps varied between 90 and 95% in all traps. Drainpipe traps baited with Pheroprax caught 7-11 Scolytidae per day per trap, while slit traps baited with Linoprax caught 10-14 Scolytidae per day per trap. High numbers of Scolytidae were caught in slit traps baited with Chalcoprax (180-230 Scolytidae per day per trap). The numbers of arthropods which were no Scolytidae caught in the traps varied very much according to the type of trap, used pheromone and per year. Every taxon has its own preference for the different types of traps. Araneae, Opiliones, Acari, Psocoptera, Aphidina, Coleoptera and Lepidoptera are preferently caught by slit traps, whereas Collembola, Dermaptera, Curculionidae (Coleoptera), Hymenoptera and Formicidae are preferently caught by drainpipe traps. The efficiency of the different types of traps (% of non Scolytidae per day per trap) according to different years was 2.7-5.1% in slit traps baited with Chalcoprax, 6.7-13.4% in drainpipe traps baited with Pheroprax, and 15-22% in slit traps baited with Linoprax. Bark beetle traps in forests catch Scolytidae and other arthropod species including their natural enemies. The relation of Scolytidae: predators varied according to the type of trap, used pheromone, and per year. According to the different years this relation was found to be high (123-331 Scolytidae per predator) in drainpipe traps baited with Pheroprax, 23.4-53 Scolytidae per predator were found in slit traps baited with Linoprax, and 22-62 Scolytidae per predator were caught in slit traps baited with Chaloprax. Under certain circumstances there may result a negative effect of the traps to the populations of the natural enemies.

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