Nectria

Nectria est un genre de champignons ascomycètes . On les rencontre le plus souvent comme saprophytes sur le bois en décomposition, mais certaines espèces peuvent aussi parasiter les arbres, notamment les arbres fruitiers (comme le pommier ) et d'autres feuillus. Certaines espèces sont des ravageurs importants, causant des maladies telles que le chancre du pommier, la brûlure des rameaux due à Nectria et la tache corail dans les vergers.

It is ubiquitous in cool temperate Europe and North America and appears to be an introduced species in New Zealand and Australia. The occurrence in New Zealand was first identified in 1996 in Otago 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 and forest products including aspen, red oak, maple, beech, poplar, and birch. Species of Nectria also occur in warmer climates including island groups such as Hawaii.

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.