''Nectria'' is a
genus
Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...
of
Ascomycete
Ascomycota is a phylum of the kingdom Fungi that, together with the Basidiomycota, forms the subkingdom Dikarya. Its members are commonly known as the sac fungi or ascomycetes. It is the largest phylum of Fungi, with over 64,000 species. The def ...
fungi
A fungus (: fungi , , , or ; or funguses) is any member of the group of eukaryotic organisms that includes microorganisms such as yeasts and mold (fungus), molds, as well as the more familiar mushrooms. These organisms are classified as one ...
. They are most often encountered as
saprophytes on decaying wood but some species can also occur as
parasites
Parasitism is a close relationship between species, where one organism, the parasite, lives (at least some of the time) on or inside another organism, the host, causing it some harm, and is adapted structurally to this way of life. The en ...
of trees, especially fruit trees (for example
apple
An apple is a round, edible fruit produced by an apple tree (''Malus'' spp.). Fruit trees of the orchard or domestic apple (''Malus domestica''), the most widely grown in the genus, are agriculture, cultivated worldwide. The tree originated ...
) and a number of other hardwood trees. Some species are significant pests causing diseases such as apple canker, Nectria twig blight, and
coral spot in orchards.
It is ubiquitous in cool temperate
Europe
Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere. It is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, the Mediterranean Sea to the south, and Asia to the east ...
and
North America
North America is a continent in the Northern Hemisphere, Northern and Western Hemisphere, Western hemispheres. North America is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South Ameri ...
and appears to be an
introduced species
An introduced species, alien species, exotic species, adventive species, immigrant species, foreign species, non-indigenous species, or non-native species is a species living outside its native distributional range, but which has arrived ther ...
in
New Zealand
New Zealand () is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and List of islands of New Zealand, over 600 smaller islands. It is the List of isla ...
and
Australia
Australia, officially the Commonwealth of Australia, is a country comprising mainland Australia, the mainland of the Australia (continent), Australian continent, the island of Tasmania and list of islands of Australia, numerous smaller isl ...
. The occurrence in New Zealand was first identified in 1996 in
Otago
Otago (, ; ) is a regions of New Zealand, region of New Zealand located in the southern half of the South Island and administered by the Otago Regional Council. It has an area of approximately , making it the country's second largest local go ...
and
Southland although it is believed to have been present since the 1980s. In North America, ''Nectria'' infections have had economically important impacts on
forestry
Forestry is the science and craft of creating, managing, planting, using, conserving and repairing forests and woodlands for associated resources for human and Natural environment, environmental benefits. Forestry is practiced in plantations and ...
and
forest products including
aspen
Aspen is a common name for certain tree species in the Populus sect. Populus, of the ''Populus'' (poplar) genus.
Species
These species are called aspens:
* ''Populus adenopoda'' – Chinese aspen (China, south of ''P. tremula'')
* ''Populus da ...
,
red oak,
maple
''Acer'' is a genus of trees and shrubs commonly known as maples. The genus is placed in the soapberry family Sapindaceae.Stevens, P. F. (2001 onwards). Angiosperm Phylogeny Website. Version 9, June 2008 nd more or less continuously updated si ...
,
beech
Beech (genus ''Fagus'') is a genus of deciduous trees in the family Fagaceae, native to subtropical (accessory forest element) and temperate (as dominant element of Mesophyte, mesophytic forests) Eurasia and North America. There are 14 accepted ...
,
poplar, and
birch
A birch is a thin-leaved deciduous hardwood tree of the genus ''Betula'' (), in the family Betulaceae, which also includes alders, hazels, and hornbeams. It is closely related to the beech- oak family Fagaceae. The genus ''Betula'' contains 3 ...
. Species of ''Nectria'' also occur in warmer climates including island groups such as
Hawaii
Hawaii ( ; ) is an island U.S. state, state of the United States, in the Pacific Ocean about southwest of the U.S. mainland. One of the two Non-contiguous United States, non-contiguous U.S. states (along with Alaska), it is the only sta ...
.
There were around 800 epithets proposed for ''Nectria'' sensu lato with 200 estimated species (Booth 1959, Rossman 1999).
According to the ''Dictionary of the Fungi'' (10th edition, 2008), the genus contains 82 species in 2008.
[ 29 species are accepted by Wijayawardene et al. 2020.]
Selected species
* '' Nectria cinnabarina'' Nectria foliicola
''Nectria foliicola'' is a fungal
A fungus (: fungi , , , or ; or funguses) is any member of the group of eukaryotic organisms that includes microorganisms such as yeasts and molds, as well as the more familiar mushrooms. These organisms ...
''
* '' Nectria fragilis''
* '' Nectria frullaniicola''
* '' Nectria gallifera''
* '' Nectria hachijoensis''
* '' Nectria heliconiae''
* '' Nectria magnispora''
* '' Nectria masseei''
* '' Nectria pertusoides''
* '' Nectria pseudotrichia''
* '' Nectria pulverulenta''
* '' Nectria racovitzae''
* '' Nectria rehmiana''
References
Nectriaceae genera
{{Sordariomycetes-stub