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Thinking about it, there isn't a Cornus close by is there? That is another wanderer.
That certainly looks like the sort of growth one gets from a tree root. We get ones like that from a Greengage. Hard to deal with without destroying the lawn. You need to trace the roots back to their source and deal with them there. Be warned some roots can go for a very long way. Our greengage ones are now coming up 20 feet away from the original (deceased) tree.
The kind of rust which attacks mint is not going to attack Raspberries. Indeed Raspberries are very tough plants and have few diseases. Pests,yes, Virus from poor stock, yes, but otherwise they are good growers.
Watch out for Oxalis, Bermudan buttercup. The seeds of this keep appearing in all the types I have tried, even after microwaving the stuff.
Also comes in white.
Save seed, it does not always survive Winter.
Reports on other sites suggest that C. hederifolium this year began in mid July. First of ours was the end of July which is about normal for us, but the main flush is just beginning now.
And the frut of Chaenomeles IS edible. We are just witing for ours to be ripe to make our batch of Quince jelly.
We lost Broadway Lights too, the other Shasta daisies thrive here, but not that one.
Pruning now will encourage new growth. If you want to keep the tree in check then prune in Winter, back to 1 new bud from the origin of the ew growths.