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Oak trees

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From: M Richars City: Dieterich, IL
There are some very large Pin? oak trees in my back yard. These trees have developed a strange growth on their branches. These growths surround the branch and developed a prickly appearance this spring and the branches don't seem to have as many leaves. I am worried about losing these trees. Do you know what this strange round prickly growth might be? It isn't on the other trees in my yard.
	Extension Message From: Ron Wolford Extension Educator, Horticulture Cook County Unit rwolford@illinois.edu
Hi, If you could email me a pic of the growth that would help. One possibility would be a burl. See pic - http://www.upenn.edu/paflora/plantclinic/burl.htm Burls will not kill the tree.
From: Zac Cap City: buffalo, NY
I have northern oak trees on a lot that just about all have developed a round growth like that pic there except it has some thorn like spikes comming out o them. It seems to have spreed to trees young and old, but more spots on the 6-10 foot trees. about 100 trees with this, there are a few pines on the lot but not strange growths. Anyway to stop?
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