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The Impact of ash dieback on veteran trees in Southwestern Sweden / Vikki Bengtsson in Baltic forestry, vol 27 n° 1 ([01/01/2021])  

Public [article]  inBaltic forestry > vol 27 n° 1 [01/01/2021] . - pp 2 - 9 Titre : The Impact of ash dieback on veteran trees in Southwestern Sweden Type de document : Article/Communication Auteurs : Vikki Bengtsson, Auteur ; Anna Stenström, Auteur ; C. Philip Wheater, Auteur ; et al., Auteur Année de publication : 2021 Article en page(s) : pp 2 - 9 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] Chalara fraxinea [Termes IGN] coupe (sylviculture) [Termes IGN] dépérissement [Termes IGN] Fraxinus excelsior [Termes IGN] maladie phytosanitaire [Termes IGN] mortalité [Termes IGN] ombre [Termes IGN] Suède [Vedettes matières IGN] Sylviculture Résumé : (auteur) Ash dieback (Hymenoscyphus fraxineus) is a fungal disease which affects ash throughout Sweden. Monitoring to study of the impact of ash dieback on veteran trees was undertaken in southwest Sweden in 2009, 2011, 2013, 2015, and 2020. The study found that 94.5% of the ash trees observed were affected by ash dieback disease in 2020 compared with 62% in 2009. 70 of the studied ash trees have died (21%) since the monitoring began. In 2009 there was no relationship between girth and ash dieback, but in 2020 the correlation between girth and the impact of ash dieback was statistically significant. In 2020, also for the first time during monitoring, the ash trees in the shade were significantly more affected by ash dieback, compared with trees standing in the open. This difference was not detected in 2013 or 2015. The effect of ash dieback on pollarded trees has varied between the years studied, but in 2020 there is no longer any significant difference between the pollarded and the non-pollarded ash trees. There was however a significant difference in the mortality rates between the groups of trees, with ash trees pollarded in more recent times having the highest mortality. Therefore, the recommendation in relation to veteran trees with ash dieback is that all pruning on veteran ash trees should be avoided. Pollarding should only be done on ash pollards that are in a regular cutting cycle and are not showing any symptoms of ash dieback. If possible, clear around old ash trees if they are in shaded conditions. Given that there are relatively few studies on the impact of ash dieback on veteran ash trees, the results of this study should also be relevant outside of Sweden and for the management of ash trees in non-woodland situations. Numéro de notice : A2021-824 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.46490/BF558 Date de publication en ligne : 02/06/2021 En ligne : https://doi.org/10.46490/BF558 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=98942 [article]