Geosmithia morbida sp. nov., a new phytopathogenic species living in symbiosis with the walnut twig beetle (Pityophthorus juglandis) on Juglans in USA

Widespread morbidity and mortality of Juglans nigra has occurred in the western USA over the past decade. Tree mortality is the result of aggressive feeding by the walnut twig beetle (Pityophthorus juglandis) and subsequent canker development around beetle galleries caused by a filamentous ascomycet...

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Bibliographic Details
Published inMycologia Vol. 103; no. 2; pp. 325 - 332
Main Authors Kolařík, Miroslav, Freeland, Emily, Utley, Curtis, Tisserat, Ned
Format Journal Article
LanguageEnglish
Published England Taylor & Francis 01.03.2011
Mycological Society of America
Subjects
Animals
Ascomycetes
Ascomycota
Bark beetles
Biological taxonomies
Branches
Coleoptera - microbiology
Coleoptera - physiology
Conidia
DNA, Fungal - genetics
DNA, Ribosomal Spacer - genetics
Fungi
Geosmithia
Haplotypes
Hypocreales - classification
Hypocreales - genetics
Hypocreales - isolation & purification
Hypocreales - physiology
insect-associated fungi
Juglans
Juglans - microbiology
Juglans - parasitology
Juglans nigra
Juglans species
Molecular Sequence Data
Mortality
Mycelium
Phylogeny
phytopathogenic fungi
Pityophthorus
Plant Diseases - microbiology
PLANT PATHOGENS
Plants
Ribosomal DNA
Scolytidae
Symbiosis
thousand cankers disease
United States
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Summary:Widespread morbidity and mortality of Juglans nigra has occurred in the western USA over the past decade. Tree mortality is the result of aggressive feeding by the walnut twig beetle (Pityophthorus juglandis) and subsequent canker development around beetle galleries caused by a filamentous ascomycete in genus Geosmithia (Ascomycota: Hypocreales). Thirty-seven Geosmithia strains collected from J. californica, J. hindsii, J. major and J. nigra in seven USA states (AZ, CA, CO, ID, OR, UT, WA) were compared with morphological and molecular methods (ITS rDNA sequences). Strains had common characteristics including yellowish conidia en masse, growth at 37 C and absence of growth on Czapek-Dox agar and belonged to a single species described here as G. morbida. Whereas Geosmithia are common saprobes associated with bark beetles attacking hardwoods and conifers worldwide, G. morbida is the first species documented as a plant pathogen.
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ISSN:0027-5514
1557-2536
DOI:10.3852/10-124