American Holly Trees Have Large Bumps Or Knots On Some Branches

Question From: R. Boulanger - Englewood, Florida, United States
Q: On two out of four American Holly trees, I see a few branches that have these rather large bumps/knots on them. What can that be? My trees are 11 years old.

A: Could be scale. Cut a sample and take it in to your independent garden center or nursery for a better Id. Best And Happy Yardening, Nancy