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Erysiphe corylacearum,an emerging pathogen of hazelnut in the EPPOregion
Native to East Asia,Erysiphe corylacearum is a new powdery mildew of hazelnuts (Corylus spp.)
which was first observed in Turkey in 2013 and has since rapidly extended its distribution range in
the Middle East,the Caucasus as well as in Eastern and Central Europe. The species is believed to
originate in Asia (China,Japan,Korean Peninsula,Russian Far East)and has been reported as an
invasive pathogen in hazelnut orchards (Corylus avellana)in Turkey,Iran and Georgia where it
causes serious damage to nut production. Symptoms are observed on the upper leaf surface,on
shoots and on fruit clusters including husks. The disease was more recently reported from Southern
Russia,the Ukraine,Switzerland,Italy and Austria. In the EPPOregion it was observed in orchards
for nut production,as well as on trees growing in mixed deciduous forests,hedges as well as in
city gardens and parks.
E. corylacearum may already be present in other European countries between Ukraine and Italy and
seems to be spreading westwards. Recent phylogenic and taxonomic studies showed that the
isolates from North America on Corylus cornuta,which were previously assigned to E.
corylacearum constitute a species of its own,named Erysiphe cornutae,sp. nov.
Adistribution map is available in the EPPOGlobal Database:
https://gd.eppo.int/taxon/ERYSCY/distribution
Sources
Arzanlou M,Torbati M,Golmohammadi H(2018)Powdery mildew on hazelnut (Corylus avellana)
caused by Erysiphe corylacearum in Iran. Forest Pathology 48,e12450.
http://dx.doi.org/10.1111/efp.12450
Beenken L,Brodtbeck T,De Marchi R(2020)First record of Erysiphe corylacearum on Corylus
avellana in Switzerland and in central Europe. New Disease Reports 41,11.
https://doi.org/10.5197/j.2044-0588.2020.041.011
Bradshaw M,Braun U,Meeboon J,Tobin P(2021)Phylogeny and taxonomy of powdery mildew
caused by Erysiphe species on Corylus hosts,Mycologia https://doi.org/10.1080/00275514.2020.1837568
Heluta VP,Makarenko NV,Al-Maali GA(2019)First records of Erysiphe corylacearum
(Erysiphales,Ascomycota)on Corylus avellana in Ukraine. Ukrainian Botanical Journal 76,252-259.
http://dx.doi.org/10.15407/ukrbotj76.03.252
- 383 -
Erysiphe corylacearum,an emerging pathogen of hazelnut in the EPPOregion
Native to East Asia,Erysiphe corylacearum is a new powdery mildew of hazelnuts (Corylus spp.)
which was first observed in Turkey in 2013 and has since rapidly extended its distribution range in
the Middle East,the Caucasus as well as in Eastern and Central Europe. The species is believed to
originate in Asia (China,Japan,Korean Peninsula,Russian Far East)and has been reported as an
invasive pathogen in hazelnut orchards (Corylus avellana)in Turkey,Iran and Georgia where it
causes serious damage to nut production. Symptoms are observed on the upper leaf surface,on
shoots and on fruit clusters including husks. The disease was more recently reported from Southern
Russia,the Ukraine,Switzerland,Italy and Austria. In the EPPOregion it was observed in orchards
for nut production,as well as on trees growing in mixed deciduous forests,hedges as well as in
city gardens and parks.
E. corylacearum may already be present in other European countries between Ukraine and Italy and
seems to be spreading westwards. Recent phylogenic and taxonomic studies showed that the
isolates from North America on Corylus cornuta,which were previously assigned to E.
corylacearum constitute a species of its own,named Erysiphe cornutae,sp. nov.
Adistribution map is available in the EPPOGlobal Database:
https://gd.eppo.int/taxon/ERYSCY/distribution
Sources
Arzanlou M,Torbati M,Golmohammadi H(2018)Powdery mildew on hazelnut (Corylus avellana)
caused by Erysiphe corylacearum in Iran. Forest Pathology 48,e12450.
http://dx.doi.org/10.1111/efp.12450
Beenken L,Brodtbeck T,De Marchi R(2020)First record of Erysiphe corylacearum on Corylus
avellana in Switzerland and in central Europe. New Disease Reports 41,11.
https://doi.org/10.5197/j.2044-0588.2020.041.011
Bradshaw M,Braun U,Meeboon J,Tobin P(2021)Phylogeny and taxonomy of powdery mildew
caused by Erysiphe species on Corylus hosts,Mycologia https://doi.org/10.1080/00275514.2020.1837568
Heluta VP,Makarenko NV,Al-Maali GA(2019)First records of Erysiphe corylacearum
(Erysiphales,Ascomycota)on Corylus avellana in Ukraine. Ukrainian Botanical Journal 76,252-259.
http://dx.doi.org/10.15407/ukrbotj76.03.252
- 383 -
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