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Over the last decades the vitality and productivity of European ash trees in Slovenia has been seriously impacted by the onset of canker and dieback disease symptoms on young and old trees, primarily identified as ash dieback caused by Hymenoscyphus fraxineus. Given the limited information available about the aetiology of this emerging disease, a study was carried out to isolate, identify and characterize the fungal species involved in the observed ash symptoms. Field surveys were conducted in five forest sites where 50 symptomatic branch samples were collected. All samples were inspected and used for fungal isolation. Based on morphology, colony appearance and DNA sequence data of the internal transcribed spacer region (ITS), 125 fungal colonies belonging to five species were isolated and identified. Only a few symptomatic ash samples yielded colonies of H. fraxineus, whereas Botryosphaeriaceae species were isolated with a high frequency, with Diplodia fraxini as the dominant species. A pathogenicity test proved that all isolated species were pathogenic on European ash, causing bark lesions and wood discoloration. All Botryosphaeriaceae species isolated in this study are reported for the first time on European ash in Slovenia. Avtorji iz Slov.: Ana Brglez, Barbara Piškur, Nikica Ogris. Bibliografija: str. 27-28.

Mineva šest let od prve najdbe invazivne tujerodne hrastove čipkarke (Corythucha arcuata) v Sloveniji, ki se že širi po vsej državi. V zadnjih letih je bilo ugotovljeno, da v slovenskih gozdovih gozdarji vrsto že prepoznavajo kot problematično. Negativni vplivi hrastove čipkarke se kažejo v rjavenju krošenj in zmanjšanju stopnje fotosinteze. Dolgoročni vplivi vrste na hraste in različne druge organizme, povezane s hrasti, pa še niso dobro raziskani. Trenutno potekajo tudi raziskave o možnostih zatiranja tega škodljivega organizma. Pripravili smo povzetek biologije, vplivov in raziskav o možnostih obvladovanja hrastove čipkarke. Za boljše razumevanje širjenja in vpliva hrastove čipkarke v slovenskih gozdovih vas vabimo k sodelovanju in sporočanju opažanj v informacijski sistem Invazivke (www.invazivke.si). It has been six years since the invasive oak lace bug (Corythucha arcuata) arrived in Slovenia and is slowly spreading over large parts of the country. Recent surveys have shown that foresters recognise that the oak lace bug is a problem for Slovenian forests. The effects are mainly a browning of the tree crowns and a decrease in photosynthesis. The longterm consequences for the trees and the interactions between other oak-related species are not yet well understood. There is research going on on different management options. We have prepared an article providing an overview of the biology, impacts, and research on control options. To better understand the spread and impact of the oak lace bug, we invite you all to submit your observations to the information system “Invazivke” (www.invazivke.si).

DOI 10.1111/j.1365-3059.2010.02262.x.