scholarly journals Spread of Hymenoscyphus fraxineus in Latvia: Analysis based on Dynamics of Young Ash Stands

2016 ◽  
Vol 70 (3) ◽  
pp. 124-130 ◽  
Author(s):  
Māris Laiviņš ◽  
Agnese Priede ◽  
Ilze Pušpure
Keyword(s):  
Fungal Pathogen ◽  
Average Rate ◽  
Fraxinus Excelsior ◽  
Forest Stands ◽  
Migration Routes ◽  
Hymenoscyphus Fraxineus ◽  
Migration Corridors ◽  
Dispersal Routes

Abstract In Latvia, during the last 15 years (2000–2015), the area of common ash Fraxinus excelsior forest stands has decreased by 40.6%. The dieback was predominantly caused by the fungal pathogen Hymenoscyphus fraxineus. Mostly young stands (up to 40 years old) were affected, accounting for 77.3% of the area of dieback. In this paper, we analysed the dynamics of young ash stand area within nature regions in Latvia to attempt to determine patterns of spread and the major migration routes of H. fraxineus. As suggested by the available data, the invasion of the fungal pathogen began in the southern part of Latvia, and then gradually dispersed across the country. The largest decline of young ash stands, during the period 2000–2010, occurred in lowlands. According to our estimate, the average rate of dispersal in Latvia was 40 km per year. At the scale of Latvia, the dispersal routes of fungal pathogen H. fraxineus largely coincide with the major migration corridors of biota and are related to macro-relief forms and their configuration.

scholarly journals Interaction between Hymenoscyphus fraxineus and Phytophthora species on young Fraxinus excelsior seedlings

2018 ◽  
Vol 94 (02) ◽  
pp. 135-139 ◽  
Author(s):  
Ivan Milenkovi´c ◽  
Nenad Keča ◽  
Dragan Karadži´c ◽  
Justyna A. Nowakowska ◽  
Tomasz Oszako ◽  
...  
Keyword(s):  
Phytophthora Species ◽  
Fraxinus Excelsior ◽  
Hymenoscyphus Fraxineus

Hymenoscyphus fraxineus (ash dieback).

2021 ◽  
Author(s):  
Jessica Needham ◽  
Joan Webber
Keyword(s):  
North Africa ◽  
Fungal Pathogen ◽  
The Other ◽  
New Disease ◽  
Ash Dieback ◽  
South West ◽  
Hymenoscyphus Fraxineus ◽  
Natural Range

Abstract H. fraxineus is an anamorphic fungal pathogen that causes ash dieback. Due to the severity of ash dieback H. pseudoalbidus has been on the EPPO Alert list since 2007. It is not known what caused the emergence of this 'new' disease (NAPPO, 2009). Its spread in Europe is thought to be mainly by ascospores, but infected nursery saplings may carry the fungus to new areas. The entire natural range of known hosts, including North Africa, Russia and south-west Asia (USDA-ARS, 2009), is currently threatened by ash dieback, with large areas already affected (Pautasso et al., 2013). Little is known about the susceptibility of the other species of ash in temperate zones.

scholarly journals Silvicultural strategies for Fraxinus excelsior in response to dieback caused by Hymenoscyphus fraxineus

2017 ◽  
Vol 90 (4) ◽  
pp. 455-472 ◽  
Author(s):  
Jens Peter Skovsgaard ◽  
Georg Josef Wilhelm ◽  
Iben M. Thomsen ◽  
Berthold Metzler ◽  
Thomas Kirisits ◽  
...  
Keyword(s):  
Fraxinus Excelsior ◽  
Hymenoscyphus Fraxineus

scholarly journals Rising out of the ashes: additive genetic variation for susceptibility to Hymenoscyphus fraxineus in Fraxinus excelsior

2015 ◽  
Author(s):  
F. Muñoz ◽  
B. Marçais ◽  
J. Dufour ◽  
A. Dowkiw
Keyword(s):  
Genetic Variation ◽  
Fraxinus Excelsior ◽  
Narrow Sense ◽  
Narrow Sense Heritability ◽  
Ash Dieback ◽  
Family Effects ◽  
Hymenoscyphus Fraxineus ◽  
Natural Range ◽  
Spatio Temporal ◽  
Crown Dieback

AbstractSince the early 1990s, ash dieback due to the invasive ascomycete Hymenoscyphus fraxineus is threatening Fraxinus excelsior in most of its natural range. Previous studies reported significant levels of genetic variability for susceptibility in F. excelsior either in field or inoculation experiments. The present study was based on a field experiment planted in 1995, fifteen years before onset of the disease. Crown and collar status were monitored on 788 trees from 23 open-pollinated progenies originating from 3 French provenances. Susceptibility was modeled using a Bayesian approach where spatio-temporal effects were explicitly taken into account. Moderate narrow-sense heritability was found for Crown Dieback (CD, h2=0.42). This study is first to show that Collar Lesions are also heritable (h2=0.49 for prevalence and h2=0.42 for severity) and that there is significant genetic correlation (r=0.40) between the severities of both symptoms. There was no evidence for differences between Provenances. Family effects were detected, but computing Individual Breeding Values (IBV) showed that most of the genetic variation lies within families. In agreement with previous reports, early flushing correlates with better crown status. Consequences of these results in terms of management and breeding are discussed.

scholarly journals Seasonal development of lesions caused by Hymenoscyphus fraxineus on young Fraxinus excelsior trees in Latvia

2018 ◽  
Vol 11 (1) ◽  
pp. 17-23
Author(s):  
I Matisone ◽  
R Matisons ◽  
K Kenigsvalde ◽  
T Gaitnieks ◽  
N Burneviča
Keyword(s):  
Fraxinus Excelsior ◽  
Seasonal Development ◽  
Hymenoscyphus Fraxineus

scholarly journals Estimating mortality rates of European ash ( Fraxinus excelsior ) under the ash dieback ( Hymenoscyphus fraxineus ) epidemic

2018 ◽  
Vol 1 (1) ◽  
pp. 48-58 ◽  
Author(s):  
Tim L. R. Coker ◽  
Jiří Rozsypálek ◽  
Anne Edwards ◽  
Tony P. Harwood ◽  
Louise Butfoy ◽  
...  
Keyword(s):  
Mortality Rates ◽  
Fraxinus Excelsior ◽  
Ash Dieback ◽  
Hymenoscyphus Fraxineus ◽  
European Ash

scholarly journals Rising Out of the Ashes: Additive Genetic Variation for Crown and Collar Resistance to Hymenoscyphus fraxineus in Fraxinus excelsior

2016 ◽  
Vol 106 (12) ◽  
pp. 1535-1543 ◽  
Author(s):  
Facundo Muñoz ◽  
Benoît Marçais ◽  
Jean Dufour ◽  
Arnaud Dowkiw
Keyword(s):  
Genetic Variation ◽  
Health Status ◽  
Fraxinus Excelsior ◽  
Narrow Sense ◽  
Narrow Sense Heritability ◽  
Ash Dieback ◽  
Family Effects ◽  
Hymenoscyphus Fraxineus ◽  
Natural Range ◽  
Crown Dieback

Since the early 1990s, ash dieback due to the invasive ascomycete Hymenoscyphus fraxineus is threatening Fraxinus excelsior in most of its natural range. Previous studies reported significant levels of genetic variability in susceptibility in F. excelsior either in field or inoculation experiments. The present study was based on a field experiment planted in 1995, 15 years before onset of the disease. Crown and collar status were monitored on 777 trees from 23 open-pollinated progenies originating from three French provenances. Health status was modeled using a Bayesian approach where spatiotemporal effects were explicitly taken into account. Moderate narrow-sense heritability was found for crown dieback (h2 = 0.42). This study is first to show that resistance at the collar level is also heritable (h2 = 0.49 for collar lesions prevalence and h2 = 0.42 for their severity) and that there is significant genetic correlation (r = 0.40) between the severities of crown and collar symptoms. There was no evidence for differences between provenances. Family effects were detected, but computing individual breeding values showed that most of the genetic variation lies within families. In agreement with previous reports, early flushing correlates with healthier crown. Implications of these results in disease management and breeding are discussed.

Sign in / Sign up

Export Citation Format

Share Document