It's all ash trees that are at risk.

The pest is the emerald ash borer. Emerald refers to the color of the beetle. It's emerald ash_borer, not emerald_ash borer.

Not familiar with that one, but sad to hear about.

It wasn't until I started growing apple trees that I realized how crazy hard it is to grow some trees. They're susceptible to insects, fungus, drought, flood, animals...etc.

Yep, had four dead ash cut down last year and a whopping 22 dead ash cut down a few weeks ago. The grub form of the ash borer can be found in the firewood rounds.