looks like something laid eggs. Im sorry i cant really give advice as i dont know exactly what it is.

wuzoo, you might want to cross-post this on the Garden Clinic Forum.

I'm far from certain, but the insects look to me like planthopper larvae. If so, they're sometimes considered more of a nuisance pest than a threat to the tree, and one can do more harm trying to eradicate them than by just letting them run their cycle.

You might also check with your local extension service. Sometimes if insect pests make an appearance in unusually large numbers, the ext. service will put out information and recommendations on control and management.

Thanks ill try the garden clinic Forum. I was just hoping someone had had the same experience with their trees and knew what to do. Would eggs cause the leaves to wilt like that though?

It wouldn't be the eggs, it would be the larvae, which are those fuzzy things (and adults, but I don't see any adults in your photos). If they are planthoppers (and I'm not sure they are), they have piercing, sucking mouthparts that they insert into the leaves to get to the liquid inside. The sticky stuff dripping on to plants below, and the car, is secreted by the insects.

Actually, I think OP's original hypothesis, that it's woolly aphids, may be on the money. Now help clear one thing up.....those are leaves of an ash tree with the fuzzy stuff, I believe. But what and where are the other plant leaves-nearby to this ash tree?

+oM