Andy Rodker

They've been aggressive here too and let's hope their efforts are successful. The landscape and ecosystems would be completely changed if this got out of control.

Yeah, same here! Our parks are dominated by Oaks. They're also among the most plentiful native trees. Invaluable to wildlife -- both native & migratory. If these nasties take hold they would decimated native forests through the eastern 1/4 of the US and quite a bit of Canada, too. The habitat loss would cause catastrophic losses to native wildlife that depends on Oaks for food -- shelter, too, to some extent, but more critically food to get them through the lean winter months.

Them things have been found in other types of tree here, too. Apparently London Plane & certain Maple trees aren't 100% safe either.

Eeek, I don't like tree killing pests! We don't have that one, but always a fight against Spruce Bark Beetle ( Ips typographus ) in the timber patch. Niklas the storm actually did us a favor, tearing down much of the non-native needle trees of the previous generation prematurely, allowing for clearing wide areas and start over with other species. A few of the new baby trees are oaks, but there is more beech and maple in the mix. But there is a pest for anything you plant now it seems...

Longhorn Bettles however are a huge family, with many harmless and even benevolent and charming members. Please be precise which one is the bad guy you have here! I assume it's the Asian Long-horned Beetle a.k.a. Starry Sky Beetle (Anoplophora glabripennis).

It IS the Asian Longhorn Beetle that's the culprit behind this kind of damage in many countries it invades.

It seems to grow into a very handsomely patterned adult, but what an awfully destructive larva he is!
https://en.wikipedia.org/wiki/Asian_long-horned_beetle