iForest - Biogeosciences and Forestry


Evaluating the impact of Hymenoscyphus fraxineus in Trentino (Alps, Northern Italy): first investigations

Stefano Giongo (1), Claudia Maria Oliveira Longa (2), Elisa Dal Maso (3), Lucio Montecchio (3), Giorgio Maresi (1)   

iForest - Biogeosciences and Forestry, Volume 10, Issue 6, Pages 871-878 (2017)
doi: https://doi.org/10.3832/ifor2486-010
Published: Nov 06, 2017 - Copyright © 2017 SISEF

Research Articles

The spread of Hymenoscyphus fraxineus has been causing great concern regarding the survival of European ash (Fraxinus excelsior) throughout Europe since the 1990s. The disease was first recorded in Trentino (southern Alps, Italy) in 2012 and has spread throughout the mountain landscape, where ash trees are scattered in small and isolated stands in different valleys. The status of the disease was checked by monitoring the damage to natural regeneration and adult trees in 90 sites spread over the whole region. The survey confirmed the complete colonization by the pathogen of the whole investigated area, with high levels of damage to both young and adult ash trees. Regeneration (both seedlings and saplings) was observed to be affected by the fungus in 88 plots out of 90. Out of 4486 examined young European ashes, 2261 (50.4%) were affected and 789 (17.6%) were already dead. Ten of the 384 assayed flowering ashes (Fraxinus ornus) showed symptoms on branches and apical stems, similar to those observed for European ash. Isolation and molecular analysis proved the presence of the fungus on both symptomatic European and flowering ashes. The examined 386 adult trees showed different levels of damage, sometimes reaching more than 75% of the crown. Some individual trees (42) growing close to severely damaged trees appeared fully healthy, which suggests the possible existence of some resistant/tolerant individuals in the examined populations.


Ash Dieback, Fraxinus excelsior, Fraxinus ornus, Natural Regeneration, Forest Management

Authors’ address

Stefano Giongo
Giorgio Maresi
Fondazione Edmund Mach, Centre for Technology Transfer, v. E. Mach 1, 38010 San Michele all’Adige, TN (Italy)
Claudia Maria Oliveira Longa
Fondazione Edmund Mach, Research and Innovation Centre, Department of Sustainable Agroecosystems and Bioresources, San Michele all’Adige, TN (Italy)
Elisa Dal Maso
Lucio Montecchio
University of Padova, Department of Land, Environment, Agriculture and Forestry, v.le dell’Università 16, 35020 Legnaro, PD (Italy)

Corresponding author

Giorgio Maresi


Giongo S, Oliveira Longa CM, Dal Maso E, Montecchio L, Maresi G (2017). Evaluating the impact of Hymenoscyphus fraxineus in Trentino (Alps, Northern Italy): first investigations. iForest 10: 871-878. - doi: 10.3832/ifor2486-010

Academic Editor

Alberto Santini

Paper history

Received: May 08, 2017
Accepted: Sep 20, 2017

First online: Nov 06, 2017
Publication Date: Dec 31, 2017
Publication Time: 1.57 months

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