cankers

navigate by keyword : affecting aperture appears black branch break brown canker cankers canopy case cluster conical covering dieback entire fruit fungal fungus infections kill large later leave multiple occur pale pathogen pedicel pedicels pimples plant plants portion protuberance pustules severe short skin small species sporecase spores spring stem top tree turn winter

Canker is a fungal plant pathogen that causes cankers on several tree species.

Canker is a fungal plant pathogen that causes cankers on several tree species. It is first seen as multiple very small, black pimples or pustules under the fruit skin before they break through the covering. Then a black conical protuberance appears, which is the spore-case of the fungus. Then a cluster of pale spores appears, on a short stem or pedicel. Later they turn black or black brown and break off the pedicels. The spores then leave the spore-case by a small aperture at the top of the case. Infections can occur in winter or spring in the US