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There's a spruce tree growing in a park near my house. It has lumps like this on a lot of the branches.

Spruce picture healthy

After a while, some of the lumps look like this:

Spruce picture dead-looking

Is this a disease, or just a part of the tree?

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    Spruce gall. Most likely the eastern possibly the adelgid. From my phone
    – kevinskio
    Jul 20, 2013 at 23:57

1 Answer 1

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As the comment says, these are spruce galls, caused by tiny insects. For more information:

http://en.wikipedia.org/wiki/Gall_adelgid

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