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What's growing on my tree? [Archive] - Arbor Day Forum

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Styckmant
07-11-2006, 06:22 PM
I have very strange broccoli looking things growing on my ash tree. (see photo)

What are they? Are they good or bad? They're really weighing down the branches.

This is our third year in the house and the first time they've appeared.

Thanks for the help.

Styckman

saccharum
07-11-2006, 07:59 PM
If I'm seeing that picture right, I think it's from the ash flower gall mite, Eriophyes (=Aceria) fraxiniflora. Very common, and not harmful to the tree. See this link: http://www.forestpests.org/ash/ashflowergall.html