Canker Diseases - Hardwoods
Canker on aspen stem caused by Entoleuca mammata.
Saperda insect galls and stem infected with Hypoxylon canker (branch on left).
Perithecia of Entoleuca mammata in stroma produced on the surface of an old canker. A part of the stroma has been cut away to show the base of the perithcia within the stroma.
Conidial pillars and areas producing asexual spores of Entoleuca mammata on surface of canker