We just planted a maple tree in our back yard and noticed today that almost every single leaf has large circular spots that appear to have been "eaten" out of the sides of the leaves. I've read about a tar disease, but I don't really see the tar on the leaves. What could it be and is there something we should do about it?



Most likely this is caused by leaf cutter bees that cut out circular discs and store them for food. They often store these discs in cracks and crevices in house siding. It doesn't do any serious harm to the tree.

Posted on 14 Jul 2008

Michael Kuhns
Forestry Specialist

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