iForest - Biogeosciences and Forestry


Lenticel infection in Fraxinus excelsior shoots in the context of ash dieback

Miguel Nemesio-Gorriz (1)   , Brian McGuinness (2), Jim Grant (3), Luke Dowd (4), Gerry C Douglas (1)

iForest - Biogeosciences and Forestry, Volume 12, Issue 2, Pages 160-165 (2019)
doi: https://doi.org/10.3832/ifor2897-012
Published: Mar 04, 2019 - Copyright © 2019 SISEF

Research Articles

Common ash (Faxinus excelsior L.) in Europe is declining on a continental scale due to the action of Hymenoscyphus fraxineus, an invasive forest pathogen that causes ash dieback disease leading to the collapse and eventual death of ash trees through shoot infection in the crown and through stem collar infection. This study confirms for the first time lenticels as entry points for pathogens to enter shoot bark. Results show the impact of lenticel infection at a very early stage of invasion by H. fraxineus in a F. excelsior provenance trial and its correlation values with other factors such as shoot dieback, canker-like lesions and bud burst. No significant provenance effects were observed for incidence of shoot dieback, lenticel necrosis or canker-like lesions on shoots, but provenance effects were significant for bud burst phenology. The strongest correlation was observed between lenticel necrosis and canker-like lesions on the lenticels of shoots. Boheremia spp. were most frequently isolated from necrotic ash lenticels and confirmed by ITS sequencing, but also species of Diaporthe, Epicoccum, Aspergillus, Neonectria, Didymella and Hymenoscyphus fraxineus. Finally, lenticel density was similar in sets of ash genotypes that were characterized as having a high and low susceptibility to ash dieback.


Ash Dieback, Lenticel, ADB, Phenology

Authors’ address

Miguel Nemesio-Gorriz 0000-0001-8052-8101
Gerry C Douglas
Forestry Development Department, Teagasc, Dublin (Republic of Ireland)
Brian McGuinness
Horticulture Development Department, Teagasc, Dublin (Republic of Ireland)
Jim Grant 0000-0003-1400-1859
Research Operations Group, Teagasc, Dublin (Republic of Ireland)
Luke Dowd
Forestry Faculty, University College Dublin, Dublin (Republic of Ireland)

Corresponding author

Miguel Nemesio-Gorriz


Nemesio-Gorriz M, McGuinness B, Grant J, Dowd L, Douglas GC (2019). Lenticel infection in Fraxinus excelsior shoots in the context of ash dieback. iForest 12: 160-165. - doi: 10.3832/ifor2897-012

Academic Editor

Alberto Santini

Paper history

Received: Jun 15, 2018
Accepted: Jan 12, 2019

First online: Mar 04, 2019
Publication Date: Apr 30, 2019
Publication Time: 1.70 months

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