Elderberries and bug problems (nursery, leaves, plant, cover)

[clownfish4]

I have a beautiful elderberry that I planted next to my front door 3 years ago. Just discovered that it was COVERED in white wooly bear caterpillars. Spent an hour picking them off and relocating them to a hedge 45 feet behind our house. Anyone know the likelihood of them staying there? Also, there are these flying things that look like ants, but with clear wings that have a cool design. They don't bite, or hurt the plant in anyway, just worried if I should be concerned with this level of infestation? Any ideas?

[wit-nit]

This product will solve your problem and it's biologically safe to use. You can find it at any nursery or garden center.
https://www.motherearthnews.com/orga...e-zw0z1304zkin

[Misty Mountains]

Do you have a pic of the wooly bear? It could be sawfly, or elderberry borers. White woolies are uncommon.

Did you have stem breakage?

[clownfish4]

I didn't know white woolies existed until I looked them up, but they look just like the pictures. Also acted just like the black and brown woolies from when I was a kid. No stem breakage, but they ate those leaves down until all that was left was the stem and vein. Haven't seen more since I moved them to the hedge. Still wondering about the flyers though. They don't hurt anything, but how many is too many? What are these?