Question: What Is Leaf Gall and Is It a Problem for Trees?
"We have a river birch tree which is about 3 years old. Suddenly this summer,
small bumps are appearing on some of the leaves. Is this a disease and
can it be stopped?"
Answer:
Sounds like you have a type of leaf gall on your river birch tree. Leaf gall is caused by an insect. The good news: Leaf gall is not considered dangerous to the plant. That is why I don't really have any advice to offer on how it "can be stopped": People generally don't take any action against leaf gall.
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