Viewing post #3082700 by CalPolygardener

You are viewing a single post made by CalPolygardener in the thread called Knots on oak tree leaves.

Mar 31, 2024 8:34 PM CST

California (Zone 9b)

They are galls caused by a midge, a tiny fly, which disfigure the leaves but won't kill the tree.
If the tree is not vigorous, you might want to have an arborist look at it and follow their recommendations.

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