Nectria is a genus of Ascomycetefungi. They are most often encountered as saprophytes on decaying wood but some species can also occur as parasites of trees, especially fruit trees (for example apple) 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.
There were around 800 epithets proposed for Nectria sensu lato with 200 estimated species (Booth 1959,[2] Rossman 1999).[3] According to the Dictionary of the Fungi (10th edition, 2008), the genus contains 82 species in 2008.[4] 29 species are accepted by Wijayawardene et al. 2020.[5]
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