Department of Botany and Mycology, Institute of Biology, Maria Curie - Skłodowska University, Akademicka 19, 20-033 Lublin, Poland
Accepted: 08 Sep 2006
Carpinus betulus (hornbeam) is a native tree in Poland, often found in natural forest communities. It is also planted in parks and gardens, often as hedgerows. In Poland two species of powdery mildews (Erysiphales) have been previously recorded on this host plant: Phyllactinia guttata (Sałata, 1985) and Oidium carpini (Piątek 2004).
In November 2005, in Lublin (eastern Poland), chasmothecia of Erysiphe carpinicola s. l. (= Uncinula geniculata var. carpinicola) were collected from leaves of hornbeam. White mycelium was present on both leaf surfaces. Appressoria were lobed, occurring in opposite pairs or solitary (Fig. 1). Conidiophores were erect with straight foot-cells (26-) 44-70 µm long. Conidia were solitary, cylindric or ellipsoid: (28-) 30-44 (-54) x (10-) 12-16 (-19) µm (Fig. 2). Ascomata numerous, on both sides of leaves scattered or gregarious (Fig. 3). Mature ascomata measure (80-) 86-110 µm in diameter. Appendages were equatorial, 2-3 times longer than the chasmothecium diameter, 16-24 per chasmocarp, circinate at the end. Asci 4-6, shortly stalked or sessile: 46-48 x 24-34 µm. Ascospores ellipsoid or ovoid: (14-)16-20 x 10-13(-14) µm; 4-5 per ascus. The specimen has been deposited in the herbarium of the Botany and Mycology Department in Lublin (LBL M-8589).
In Europe this species has previously been recorded in Hungary (Vajna, 2006) and theUkraine (Minter et al., 2004). This is the first finding in Poland.
Minter DW, Hayova VP, Minter TJ, Tykhonenko Y-Y, Andrianova TV, Dudka IO, Heluta VP, Isikov VP, Kondratiuk SYa, Krivomaz TI, Kuzub VV, Prydiuk M, 2004. Electronic Distribution Maps of Ukrainian Fungi. [http://www.cybertrufle.org.uk/ukramaps/index.htm].
Piątek M, 2004. First report of powdery mildew (Oidium carpini) on Carpinus betulus in Poland. Plant Pathology 53, 246. (First published online: New Disease Reports 8, http://www.ndrs.org.uk/jan2004/2003-67.asp)
Sałata B, 1985. Mączniakowe (Erysiphales). In: Kochman J, Skirgiełło A, eds. Flora Polska. Rośliny Zarodnikowe Polski i Ziem Ościennych. Grzyby (Mycota) 15. Warszawa-Kraków, Poland: Państwowe Wydawnictwo Naukowe, 1-247, pl. I-XXXV.
Vajna L, 2006. Powdery mildew caused by Erysiphe carpinicola on Carpinus betulus in Hungary: the first European report. Plant Pathology 55: 575 (First published online: New Disease Reports 12, http://www.ndrs.org.uk/jan2006/2006-08.asp).
©2006 The Authors