Oak Issues

[topnotchtree]

Can somebody tell me what is bothering my oak trees? The pic is from a smaller sapling on my property, but I think my larger mature oaks have the same problem. Does this look like a cause for concern?

 

[topnotchtree]

Here are a couple more pics...

 

[topnotchtree]

thanks treeco, that gives me some reading to do. is there anything else it could be?

 

[treeseer]

Sure looks like Neuroterus. Dan found it. To make sure, drop some on the ground and see if they jump!

 

[Ekka]

Man you guys get some wierd **** on ya trees!

I think sunlight cures a lot of problems.