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DOI: 10.3852/08-214
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Mycologia, 101(6), 2009, pp. 833-840.
© 2009 by The Mycological Society of America

The avocado subgroup of Phytophthora citricola constitutes a distinct species, Phytophthora mengei sp. nov.


C.X. Hong 1

     Virginia Polytechnic Institute and State University, Hampton Roads Agricultural Research and Extension Center, Department of Plant Pathology, Physiology and Weed Science, 1444 Diamond Springs Road, Virginia Beach, Virginia 23455

M.E. Gallegly

     West Virginia University, Division of Plant and Soil Sciences, Morgantown, West Virginia 26506

G.T. Browne

     USDA-ARS, Crops Pathology and Genetics Research Unit, Department of Plant Pathology, University of California, One Shields Avenue, Davis, California 95616

R.G. Bhat

     University of California, Department of Plant Pathology, One Shields Avenue, Davis, California 95616

P.A. Richardson
P. Kong

     Virginia Polytechnic Institute and State University, Hampton Roads Agricultural Research and Extension Center, 1444 Diamond Springs Road, Virginia Beach, Virginia 23455

Isolates from avocado tree cankers have been recognized as a distinct subgroup within the P. citricola complex since 1974, both morphologically and molecularly (isozyme and amplified fragment length polymorphism [AFLP] analyses). This subgroup is formally separated from P. citricola after comparative DNA fingerprinting and sequence analyses of the ITS region, as well as by morphological examinations. This new taxon is homothallic, produces plerotic oospores with paragynous antheridia and noncaducous semipapillate sporangia. Morphologically it differs from other species of Waterhouse group III by producing many large bizarre-shaped sporangia and smaller oogonia with asymmetric capitate antheridia. It belongs to clade 2 and is phylogenetically closer to P. siskiyouensis, P. capsici and P. tropicalis than to P. citricola. P. mengei can be easily differentiated from its relatives in the same clade and other species of this morpho-group by DNA fingerprints and sequence analysis. This new taxon is named Phytophthora mengei sp. nov.

Key words: avocado canker pathogen, identification, Oomycete

1 Corresponding author. E-mail: chhong2{at}vt.edu






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Copyright © 2009 by The Mycological Society of America.