Canadian Journal of Botany - Revue Canadienne de Botanique (2004) 82, 1730-1743

Henrietta Myburg, Marieka Gryzenhout, Brenda D. Wingfield, Michael G. Milgroom, Shigeru Kaneko and Michael J. Wingfield (2004)
DNA sequence data and morphology define Cryphonectria species in Europe, China, and Japan
Canadian Journal of Botany - Revue Canadienne de Botanique 82 (12), 1730-1743
Abstract: Cryphonectria includes important tree pathogens as well as species believed to be saprophytes. Recent phylogenetic studies have concentrated on North American and southern hemisphere Cryphonectria spp., but little is known about Asian and European taxa. In this study we identify and differentiate among the species occurring in Europe, China, and Japan using morphological and phylogenetic comparisons among the Cryphonectria species. Phylogenetic comparisons were based on sequence data from the ribosomal ITS operon and two regions in the ß-tubulin gene. Unknown Japanese and Chinese isolates showing different cultural features than those of Cryphonectria parasitica (Murrill) M.E. Barr from Japan and the USA, grouped with isolates of Cryphonectria nitschkei (G.H. Otth) M.E. Barr from Quercus spp. and Rhus javanica L. Isolates of Cryphonectria havanensis (Bruner) M.E. Barr from Quercus grosseserrata Blume, Castanopsis cuspidata Schottky, Pyrus sinensis Lindl., and Eucalyptus globulus Labill. also grouped in this phylogenetic clade. We propose that Cryphonectria nitschkei and the fungus that has been referred to as Cryphonectria havanensis in Japan should be treated as a single taxon. Phylogenetic and morphological data also suggest that there are two species currently representing Cryphonectria radicalis (Schwein.: Fr.) M.E. Barr in Europe. One of these species is similar to the type specimen of Cryphonectria radicalis, while the other species probably is new.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Brenda D. Wingfield, Michael J. Wingfield, Marieka Gryzenhout, Michael G. Milgroom

Research topic(s) for pests/diseases/weeds:
identification/taxonomy

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Cryphonectria parasitica
	Cryphonectria (genus)
	Cryphonectria radicalis
	Cryphonectria nitschkei		Japan
	Cryphonectria nitschkei	Oak (Quercus)
	Cryphonectria nitschkei	Eucalypt (Eucalyptus)