My only comment is they used to be terrible here, they would denude even large linden trees. I put down Milky Spore about 15 years ago and JB population is greatly reduced. I only put it down on lawn/turf. It doesn't work overnight but it does work.

ps, search numerous threads on houzz for milky spore.

Probably it will survive IF the tree has no other problems.

We have a problem and while it is not solved it is greatly reduced. We planted a butterfly bush under the tree, and have a butterfly garden not far from the tree. As I said it is not perfect but the birds eat the insects, and reduce the damage to the point it is not noticeable.

When we moved in to this house 10 years ago we had a tent worm problem. This summer when I noticed the couple of tents in the tree, the birds had already found them and had taken care of. the problem

You would be surprised at the number of insects a couple of broods of baby birds.

Thanks. I used to think nothing would eat the JBs, but for several years I've noticed sparrows doing so, never saw them actually eating them, but attacking and pecking at them. This year however, there has been SO many in our area eating fruit tree leaves especially. Did the Linden trees survive?

AND the Virginia Creeper that grows on the side of the garage. The JBs can eat all the Virg.Crpr they want elsewhere on the property but I like it on the side of the garage, I keep it in good check there. Turns red in the Fall, very pretty. This year it is nearly all but skeletonized like the cherry tree.

The tent worm is a problem mostly in the tall walnut trees and also the crabapples. They seem to invade every other year.

sure looks like more than 1 out of every ten leaves ...

bug plagues are cyclical ... the 10 year event.. the hundred year event.. all akin to the cicada hordes .. its normal ...

if we are talking prunus serotina ... its native covering just about everything east of the Mississippi ... native trees shouldnt be destroyed by bugs .... the trees are ubiquitous ... everywhere ...

https://duckduckgo.com/?t=ffsb&q=prunus+serotina+native+range&iax=images&ia=images

and ive seen near denuding of trees by severe hail storms.. you know.. those once every ten year storms ... and they pop back ...

as noted.. if otherwise healthy.. the tree should be fine.. i would think it will releaf ... and you wont notice any difference next year .... though using/losing all that stored energy.. it might grow with less vigor compared to the norm.. but that will be hard to note on a huge old tree ...

its like the giant mushroom show show after felling a tree .. its a free show of nature.. enjoy it ... and be amazed at ma nature ...

ken