MonitoringIps typographusandPityogenes chalcographus(Col., Scolytidae) in Lower Saxony and Schleswig-Holstein

Due to the intensive management of German forests, the main purpose of bark beetle monitoring is not to detect stands of high infestation risk. Much more, monitoring shall give a rough idea of regional population trends. Some years experience show that single monitor traps more than 50 m apart from each other use to cause pheromone induced infestations in nearby standing spruce. Thus, in 1988 a system of monitoring has been established in Lower Saxony and Schleswig-Holstein which consists of mass trapping lines along stand margins as usual (distances of 30-50 m between traps and 10-15 m between traps and next spruce) but each of them with one fortnightly checked trap: the monitor trap (.)