Red spots on maple tree - Knowledgebase Question

Question by grosskopf
April 27, 2010
I have an 8 yr. old maple tree in the back yard which gets sun all day. I was looking at it today and it has red spots the size of a pin point on the leaves. What is it? What should I do about it?

Answer from NGA
April 27, 2010


It sounds like maple leaf spindle gall and it's cause by mites feeding on the leaves. There's not much you can do - the damage is already done and the mites are long gone. The affected leaves may fall earlier in the season, but it rarely affects the health of the tree.

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