What the heck is growing on these leaves?

What the heck is growing on these leaves?

Found these odd yellow growths on the leaves of one of the trees near the house. It's mostly shady.

Let it live, treat it, or kill it?

Blackcat Blackcat
Jun '16

I think they are leaf galls from insect damage and/or egg laying.

This particular one looks like a "nipple gall"... there's a picture on this page that's almost identical.

https://nhgardensolutions.wordpress.com/tag/nipple-gall/

Mark Mc. Mark Mc.
Jun '16

Exactly on the money, Mark Mc. That's what it is!

peacefulthoughts peacefulthoughts
Jun '16

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