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ŠUMARSKI LIST 5-6/2019 str. 23     <-- 23 -->        PDF

Domowit-Trypowit D® (Table 2.). Because of period when panel traps were exposed it is not surprising that T. signatum was dominant species, and early ambrosia beetle T. domesticum showed small numbers because it’s swarming period was at its end. In year 2010 same attractive components were tested in integrated oak timber protection ETOH, GLV and Domowit-Trypowit D® (Table 3.).
More specimens of X. germanus were caught in year 2010. than in year 2009. because of period when traps were exposed. Panel traps in 2011 and captured first swarming of X. germanus (Table 4.). In 2016, Xylosandrus germanus was trapped in a monitoring program administrated by the Swedish Board of Agriculture (Björklund & Boberg 2017). There are evidences and proofs how beetle can be easily transmitted and established by various means of spread even in the northern parts of Europe. The likelihood of entry of Xylosandrus germanus into Sweden is assessed to be very likely. Species have already been trapped at two different occasions in Sweden. The main pathways are “Wood and wood products” and “Natural spread”. Spread to Sweden has increased since X. germanus recently established in Denmark. Also the likelihood of establishment is assessed to be very likely since suitable host are widely distributed, the climate is suitable and the species have a track record of being able to establish in different environments. If established, the rate of spread is assessed to be high based on the species high flight capacity and the high likelihood of spread through transportation of colonized material (Björklund & Boberg 2017).
Conclusions
Zaključci
X. germanus is invasive species that is now present in Croatian lowland oak stands near Zagreb. Its presence in our oak stands is confirmed with our panel trap catches in years 2009, 2010. and 2011. but also from findings in oak timber that was used in part of our experiment in integrated round oak timber protection (Franjevic et_al 2016). Absence from our lineatin baited panel traps can be explained for reason of early trap deployment because our data show that first swarming of X. germanus in our oak stands starts from beginning of April, and reason for lack of X. germanus catches can be explained in two in two ways. It is possible that X. germanus was not yet present in our lowland oak stands near Zagreb, or it had low level population that was not registered by panel trap catches. It is also possible that period of trap deployment was early to register swarming of X. germanus that usually begins in first weeks of April (Peer & Taborsky 2005). Ethanol is one of most attractive stress-related volatile to X. germanus (C. M. Ranger et al. 2010), so it is open for further experiments to conclude attractivnes of