I promised that I would give you more chances to use the skills you have learned in the Master Gardener course. Now's your chance to impress us with your horticulture knowledge.
Each year we have a lot of people bringing in their scrub oak with this problem. Can you figure how what happened to this branch? Give me your best educated guess.
I'm not a Master Gardener, but those look like galls made by wasps when laying eggs.
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