Assertion: diffuse canker | /r/CreatedBy | facultative parasites
Facets:
value: often
type: TEMPORAL
Source sentences:
text: Diffuse cankers are often caused by facultative parasites, meaning they are normally saprobes, perhaps colonizing dead twigs or old sloughed-off bark, but under certain conditions that we usually interpret as stressful to the host, these fungi are able to overcome the host defenses and cause cankers.