Pine Oak Blobs

[JeffandTamara]

I have a pine oak in the front yard that we noticed last summer that started to get these blobs on it. I have a few questions....
(1) What are they, is this a common problem?
(2) Will they hurt/kill the tree?
(3) Can you treat them
(4) Will they spread. ( I think I know the answer to this one, I noticed another Pin Oak that has a few on it. But the Pin Oak right next to the infected one, does not have any YET!
(5) What should I do about this tree?

I would appreciate any insight into this.....
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[buzz sawyer]

Maybe this?

MBG Integrated Pest Management

Gouty Oak Galls Fact Sheet -- Woody Ornamental Integrated Pest Management at Penn State

http://web.extension.illinois.edu/jackson/downloads/5600.pdf

 

[JeffandTamara]

Thanks Buzz..I think You nailed it....

 

[ch woodchuck]

Horned oak gall...

http://www.treelink.org/joa/2001/march/06_HORNED_OAK_GALL_eliason.pdf