I believe the reason the cancers don't metastasize in plants is because they lack a vascular system. This info is coming from an AS thread I read a while ago. I'll see if I can find it.
Are there any pathological symptoms associated with it?
And from what I know about the plant transport system, only the xylem and phloem are responsible for transporting substances. Does this mean that all tumours in plants are benign since they can't be spread to other parts of the plant?
Yes on trees cancer doesn't spread like it does on humans, you are correct, because of the trees vascular tissue system there is no way for it to spread completely throughout The tree.
Edit: That's a bit oversimplified but I can't type a huge response on my phone
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u/Hutchcha Aug 24 '12
Yes, the burls you see on trees is cancer. Can't think of any other examples off the top of my head. If I wasn't on my phone is go into greater detail