''Nectria mammoidea'' var. ''rubi'' is a
plant pathogen
Plant pathology (also phytopathology) is the scientific study of diseases in plants caused by pathogens (infectious organisms) and environmental conditions (physiological factors). Organisms that cause infectious disease include fungi, oomyc ...
that affects raspberry canes.
References
Fungal plant pathogens and diseases
mammoidea var. rubi
Fungi described in 1911
{{fungus-plant-disease-stub