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ŠUMARSKI LIST 5-6/2019 str. 21     <-- 21 -->        PDF

First occurrence of Xylosandrus germanus (Blandford, 1894) – black steam borer in pheromone baited panel traps and population build up in Croatian oak stands
Prvi ulovi Xylosandrus germanus (Blandford, 1894) u naletno-barijernim klopkama i porast populacije u nizinskim hrastovim sastojinama Hrvatske
Milivoj Franjević, Zoran Šikić, Boris Hrašovec
Summary
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.
Key words: ambrosia bark beetles, integrated oak timber protection, CEN EN 1316-1, FSC certified forests, invasive alien species
Introduction
Uvod
Invasive species of insects represent challenge for forest protection in conditions of managed FSC certified forests in which use of insecticides is restricted. Croatian forests are about 90 % state owned and are FSC certified. In oak stands in Croatia ambrosia beetles are important economical pests that degrade value of round oak timber that is exposed to these beetles during winter harvesting (Franjevic et al,2016) Most important species are from genus Trypodendron and Xyleborus. Earliest species to invade exposed oak timber are Trypodendron domesticum (Linnaeus, 1758) and Trypodendron signatum (Fabricius, 1792) which swarm in late January and early February. In mid spring these are followed