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Effects of Verticillium nonalfalfae on Ailanthus altissima and associated indigenous and invasive tree species in eastern Austria / Olivier Maschek in European journal of forest research, 137 (2018) 

Public Citation [article]  inEuropean journal of forest research > 137 (2018) . - 197-209 Titre : Effects of Verticillium nonalfalfae on Ailanthus altissima and associated indigenous and invasive tree species in eastern Austria Type de document : Imprimé Auteurs : Olivier Maschek ; Erhard Halmschlager Année de publication : 2018 Article en page(s) : 197-209 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Plantes subspontanées, naturalisées, envahissantes Mots-clés : Ailanthus altissima (Mill.) Swingle, 1916  Verticillium nonalfalfae Résumé : The naturally occurring Verticillium nonalfalfae shows promise for biocontrol of the highly invasive Tree of Heaven (Ailanthus altissima), but might also bear a risk for non-target tree species. In this study, we conducted inoculations on potted seedlings of A. altissima as well as on eight indigenous and two invasive tree species associated with Tree of Heaven in Austria. Although vascular discolourations developed in all inoculated tree species, V. nonalfalfae was reisolated from Ailanthus and eight of the ten non-target-species, whereas typical disease symptoms and mortality only occurred on A. altissima. Results confirmed high susceptibility (S) of A. altissima to V. nonalfalfae but indicated tolerance (T) of Acer campestre, Acer pseudoplatanus and Quercus robur, possible resistance (PR) of Fraxinus excelsior, Populus nigra, Tilia cordata, Ulmus laevis and Ulmus minor and resistance (R) of Fraxinus pennsylvanica and Robinia pseudoacacia to this potential biocontrol agent. Results from seedling inoculations were confirmed by cursory field observations in Ailanthus-inoculated forest stands, where admixed A. campestre, A. pseudoplatanus, F. excelsior, Populus alba, R. pseudoacacia and U. laevis canopy trees remained asymptomatic, while mortality was induced in Ailanthus. Lien pérenne : DOI : 10.1007/s10342-018-1099-y Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=149374 Maschek, Olivier, Halmschlager, Erhard 2018 Effects of Verticillium nonalfalfae on Ailanthus altissima and associated indigenous and invasive tree species in eastern Austria. European journal of forest research, 137: 197-209.

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Further pathogenicity testing of Verticillium nonalfalfae, a biocontrol agent against the invasive Tree of Heaven (Ailanthus altissima), on non‑target tree species in Europe / Yvonne Lechner in Phytoparasitica, 51 (2023) 

Public Citation [article]  inPhytoparasitica > 51 (2023) . - 113-130 Titre : Further pathogenicity testing of Verticillium nonalfalfae, a biocontrol agent against the invasive Tree of Heaven (Ailanthus altissima), on non‑target tree species in Europe Type de document : Imprimé Auteurs : Yvonne Lechner ; Olivier Maschek ; Thomas Kirisits ; Erhard Halmschlager Année de publication : 2023 Article en page(s) : 113-130 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Plantes subspontanées, naturalisées, envahissantes [CBNPMP-Géographique] Europe Mots-clés : Ailanthus altissima  Verticillium nonalfalfae Résumé : Verticillium nonalfalfae is an effective biological control agent against the highly invasive Tree of Heaven (Ailanthus altissima) in Europe, and previous research on ten economically and ecologically important tree species occurring in Austria have so far not revealed undesired non-target effects. In this study, another nine tree species including five native, two non-native as well as two invasive alien tree species were tested for susceptibility to the particular strain of V. nonalfalfae (Vert56) used for biological control of A. altissima. Stem inoculations on potted seedlings revealed that this strain of V. nonalfalfae is generally host-adapted to A. altissima. It induced chlorosis, necrosis and wilting already within two weeks post inoculation on A. altissima and resulted in almost completely defoliated or dead seedlings at the end of the vegetation period. Apart from two species (Quercus rubra and Sorbus aucuparia), that suffered from other abiotic/biotic agents, no mortality was observed on all other tree species tested; however, symptoms caused by other abiotic factors were also found on Prunus avium and Ulmus glabra. All tested tree species exhibited vascular discolorations and the fungus could be re-isolated at varying frequencies (6-100%) from inoculated seedlings of all non-target tree species, although five of these species exhibited no external symptoms. Results confirmed high susceptibility (S) of A. altissima to V. nonalfalfae, whereas Acer platanoides, Castanea sativa, Q. rubra, S. aucuparia and U. glabra were considered as tolerant (T), and A. negundo, P. avium, P. serotina and Q. petraea were rated as possible resistant (PR) due to the low rates of re-isolation. Lien pérenne : DOI : 10.1007/s12600-022-01032-z Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=154197 Lechner, Yvonne, Maschek, Olivier, Kirisits, Thomas, Halmschlager, Erhard 2023 Further pathogenicity testing of Verticillium nonalfalfae, a biocontrol agent against the invasive Tree of Heaven (Ailanthus altissima), on non‑target tree species in Europe. Phytoparasitica, 51: 113-130.

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Consultable Article (2023) URL