https://extension.usu.edu/planthealth/ipm/notes_ag/fruit-gummosis
Gummosis (Cytospora/Perennial Canker) | USU
This page contains information on gummosis of fruit trees, including hosts, biology, symptoms, and management.
perennialcankerusu
https://species.wikimedia.org/wiki/Leucostoma_(Valsaceae)
Cytospora - Wikispecies
wikispecies