What happened to this root?

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Arclight

Just Trimmin'
Joined
May 5, 2015
Messages
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Location
San Diego
I carefully removed a pear tree with fire blight, and as I was digging up the root stock I noticed these nodules. I don't know whether they are nematodes or perhaps some sort of fungus or bacterial infection.

Here are some pictures:

Can anyone identify these nodules?
 

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