First occurrence of xylosandrus germanus (Blandford, 1894) – Black steam borer in pheromone baited panel traps and population build up in croatian oak stands

Abstract

During the first decade of 21st century in Croatian oak stands series of experiments concerning integrated oak timber protection were conducted. In the focus of this research was olfactory manipulation with native ambrosia beetles from genus Trypodendron and Xyleborus. Pheromone baited panel traps were used completed with different attractive components (lineatin, ETOH, GLV, Domowit-Trypowit D®) . During these experiments in trap catches new species of scolityd for Croatian lowland oak stands entomofauna was discovered. Occurrence of Xylosandrus germanus was first time registered in a second season of field experiments and its numbers had since continuously grown in trap catches. In 2011. monitoring of flight period for ambrosia beetles was conducted from beginning of January till early June. During this period six species of ambrosia beetles were caught among them most numerous species was T. signatum while X. germanus was second although only present in trap catches for four years.