Help needed diagnosing dogwood

[Megan]

My three year old dogwood has developed what looks like rows of tufts on the underside of many of its branches. (Pictures included). I can't seem to find a comparable example by Googling. Does anyone know what is affecting my tree and how I can treat it?

 

[Woodtroll]

That looks like cicada damage, as best as I can tell from the photos. They split the bark/twigs where they lay their eggs. The twig past that damage often dies, but it doesn't usually kill the tree unless it's a small one with a lot of damage.

Were you in the cicada cycle zone this year, by chance?