Section outline

◄General Information
►Host Tree

  • Phylum - Ascomycota

    Class - Sordariomycetes

    Family - Ophiostomataceae

     Genus - Ophiostoma

    Three species are now recognized:

    • The first agent of DED Ophiostoma ulmi (Buisman) Melin & Nannf. (previous synonyms Graphium ulmi M.B. Schwartz, Ceratostomella ulmi Buisman, Ceratocystis ulmi (Buisman) C. Moreau, Pesotum ulmi (M.B. Schwartz) J.L. Crane and Schokn) (Lepik 1940a; Brasier and Buck 2001).
    • Ophiostoma himal-ulmi, a species endemic to the western Himalaya (Mehrotra 1995).
    • Ophiostoma novo-ulmi, a virulent species the causal agent of second pandemic. It has two different subspecies – O. novo-ulmi subsp. novo-ulmi and O. novo-ulmi subsp. americana (Brasier and Kirk 2001, Brasier et al. 2004). Also, their hybrids were discovered and introduced thereafter (Konrad et al. 2002, Brasier and Kirk 2010). Because subspecies of O. novo-ulmi overlap in Europe (Martín, Fuentes-Utrilla et al. 2010) and gene flow between them lacks strong barriers (Brasier and Buck 2001), they are hybridizing freely (Santini et al. 2005, Tziros et al. 2017).
◄General Information
►Host Tree