We have a young maple tree in Mich it has red and green bumps on it leaves?
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Answers:
These are insect eggs. They will not do much harm to the tree. Take a leaf to your extension office, and they will be able to tell you if you need to spray the tree, or if the bugs can be ignored.
They are maple bladder galls. They are caused by a small mite. They do no real harm or threaten the health of the tree. Here is an article with pictures for you to verify and read more about the condition: http://ohioline.osu.edu/hyg-fact/2000/20...
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