DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 9-10/2017 str. 45     <-- 45 -->        PDF

Nymph molts were mostly dark with translucent yellowish parts on both sides. They had numerous spines. Numerous tar-like black spots of bug excrement (faeces) were located evenly on the underside surface of oak leaves with larval molts and groups of eggs. The find and identification of the pest was reported to the NPPO of Slovenia on 30 November 2016. In July 2017 we found egg clusters, nymphs and adults of C. arcuata on oaks near village Zakot in large numbers and chlorosis on the leaves as a result of sucking. Wider search revealed small populations of oak lace bug on the edge of Krakovo oak forest, which is 17 km air distance from the first find at village Zakot (Figures 1-6).
The spread of C. arcuata in Croatia has been extremely rapid, most probably due to the main traffic corridors. Three years after the first record, this invasive bug was present from the easternmost parts of Croatia, where its population reached huge numbers, all the way to the central part of the country where only scattered foci were discovered in the following years (Franjević et al., 2016). The northern border of the forest, where the bug was found in Slovenia, is formed by a railway line leading from the Balkan region to Central Europe. The close proximity of the Zakot site from the find in Croatia suggests that the bug spread naturally from Croatia to Slovenia, but since the site of the find is also near the railway line, it is also plausible that it was introduced from the heavily infested southern regions of the Balkans via rail transport.
In Slovenia, as well as other European countries, it will be important to focus our attention on the very probable quick