Geosmithia morbida

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Geosmithia morbida
Scientific classification
Kingdom: Fungi
Division: Ascomycota
Class: Sordariomycetes
Order: Hypocreales
Family: incertae sedis
Genus: Geosmithia
Species: G. morbida
Binomial name
Geosmithia morbida
M.Kolařík, E.Freeland, C.Utley & Tisserat (2010)

Geosmithia morbida is a species of anamorphic fungus that causes thousand cankers disease in species of walnut trees (Juglans spp.). It was described as new to science in 2010 from specimens collected in the southern United States. The fungus, transmitted by the walnut twig beetle, Pityophthorus juglandis, is known from the western USA from California to Colorado. The cankers resulting from infection restrict nutrient flow and typically kill the host tree within three to four years. Based on closeness of internal transcribed spacer DNA, the closest relative of G. morbida is G. fassatiae. The specific epithet morbida refers to the deadly pathogenic effect it has on its host.[1]


  1. ^ Kolarík M, Freeland E, Utley C, Tisserat N (2011). "Geosmithia morbida sp. nov., a new phytopathogenic species living in symbiosis with the walnut twig beetle (Pityophthorus juglandis) on Juglans in USA". Mycologia. 103 (2): 325–32. PMID 20943528. doi:10.3852/10-124.  open access publication – free to read

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