Neonectria ditissima

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Neonectria ditissima (syn. Neonectria galligena) red-orange spherical perithecia on the fissured bark of infected stem of Swietenia mahagoni (click on image to enlarge it)
Author(s): Edward L. Barnard, Florida Department of Agriculture and Consumer Services
Source: IPM Images

Neonectria ditissima (Tul. & C. Tul. 1865) Samuels & Rossman 2006

In Europe and some other regions, this fungus causes canker on various trees, as well as rots on apple and pear fruits (European canker of apple and pear trees). It enters the plants through wounds, e.g. pruning wounds. In North America, it is often involved in the "beech bark disease" in combination with the beech scale, Cryptococcus fagisuga which facilitates entry of the fungus into the tree. For a review of this disease see Mihál et al., 2015.

In Europe, a similar disease has been described as "beech bark necrotic disease" which is characterized by necrotic wounds on the bark which results in deformities and the breaking of branches. This disease is again associated, among others, with Cryptococcus fagisuga.

Vernacular names
• Deutsch: Buchenkrebs
• English: beech canker
European canker
European fruit tree canker
• Français: chancre européen

Cylindrocarpon heteronema
Cylindrocarpon willkommii
Nectria ditissima
Nectria galligena
Neonectria galligena