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(MN822722), and showed low similarity of 83% and 85% each to P. guttata (AB080558).
Pathogenicity tests were accomplished on ten healthy two-year-old plants of C. avellana cv.
¡®Merveille de Bollwiller¡¯ with the two isolates under controlled environment on 25¡ÆC, 80%
humidity and 16/8 photoperiod. Plants were artificially inoculated by conidial suspension
droplets (104/ml). Symptoms appeared after 7-8 days after inoculation and the developing
fungus was morphologically identical to the original isolates. Control plants were treated with
distilled water, no symptoms were found on them. E. corylacearum was first observed on C.
avellana in Turkey in 2013 (Sezer et al. 2017) and was considered as a highly destructive
pathogen. It is also known in neighbouring countries, Ukraine (Heluta et al, 2019), Austria
(Voglmayr et al. 2020) and Romania (Rosati et al. 2021). To our knowledge, this is the first
report of Erysiphe corylacearum in Hungary.
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