|
Geosmithia Flava
''Geosmithia'' is a genus of anamorphic fungi of uncertain family (biology), familial placement in the order Hypocreales. The genus, circumscribed by Australian mycologist John Pitt in 1979, is widely distributed. A 2008 estimate placed ten species in the genus, but several new species have since been described. Thousand cankers disease, which affects economically important black walnut (''Juglans nigra'') populations in North America, is caused by ''Geosmithia morbida''. Species in the genus are generally similar to those in ''Penicillium'', but can be distinguished from them by forming cylindrical conidia from rough-walled phialides. Additionally, the conidia of ''Geosmithia'' do not have a green color, in contrast to the characteristic blue-grey or green-grey conidia of ''Penicillium''. Some ''Geosmithia'' species have Teleomorph, anamorph and holomorph, teleomorphic forms that are classified in the genus ''Talaromyces''. However, ''Geosmithia'' is a polyphyletic taxon with evo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geosmithia Morbida
Geosmithia morbida is a mitosporic ascomycete fungus belonging to the order Hypocreales and the family Bionectriaceae. This fungus is recognized as the causal agent of Thousand Cankers Disease (TCD), a significant threat to walnut trees. The disease derives its name from the multitude of coalescing cortical cankers that develop around the entrance holes created by its insect vector, the walnut twig beetle (''Pityophthorus juglandis''). The relationship between ''Geosmithia morbida'' and ''Pityophthorus juglandis'' is symbiotic, with the beetle carrying the fungal conidia on its body and introducing them to healthy walnut trees as it bores through the bark. While the greatest damage is observed on black walnuts (''Juglans nigra''). Invasiveness TCD was first seen in the western United States. In 2010 it was found in Tennessee, which was the first time it appeared in the eastern part of the country. This raised worries because the eastern US has many native black walnut trees, wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |