What killed this limb?

[Catscratch]

What did this?
I was walking the orchard and about 3' of a limb was hanging with black leafs. Pear tree. It was barely hanging so I grabbed it and took a look. Hole down the middle and what likes like a clean cut going out. Didn't see it anywhere else on any of the other trees.

 

[ethompson]

I blamed my nephew and friend when they were kids because I found an oak tree with similar marking on a broken branch. But believe it or not it was the wind. I've have since noticed hundreds of branches missing from smaller trees with the same kind of markings.

 

[b116757]

Mine occasionally loose limbs just like that they very nearly look cut off except for the bark. I believe there is a name for it and some verities are more prone than others but it’s name escapes me.

 

[homerj]

A possibility https://extension.okstate.edu/progr...opods/apple-twig-borer-amphicerus-bicaudatus/