Answer: I don't know whether you're dealing with transplant stress or if a fungal disease is trying to take hold of your weigela. I'd recommend pruning off the affected foliage (then bag a few leaves up and take it to your local Cooperative Extension office, Master Gardener Clinic, or favorite nursery and ask their advice). It's much easier to diagnose a plant problem when you can see it first-hand! Best wishes with your landscape!
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