Epicormic growth is simply a growth habit, only if it is caused by an organism separate to the tree would it merit an ID. That would be hard to know for sure, and is usually not because of disease or pests. The most obvious cases are called witch’s broom. You can mention presence of epicormic growth in the observation notes, or in a comment, or as a observation field
I think your problem is this:
There are plenty of reliable sources other than a large language models which some wouldn’t even consider a source, more of a hearsay generator.
While what it said is not entirely incorrect, it doesn’t explain what it is, and misses some causes. Sorry, I know you didn’t ask for it, this is a personal problem I have with people using “AI” as an educational tool, it decreases research skills.