Rather than eggs, perhaps aphids. If so, and depending upon the size and location of the tree, easily washed off or squished. Repeat as needed.

Would it be possible to focus on ONE of these insects? I can't really tell for certain what they are. They certainly seem to be aphid-like. Aphid eggs are dark, by the way. Jean's suggestion, by the way, is the recommended means of control.

For aphids to have been that busy on your maple, the adults would have to have been present prior to this infestation. Was the tree outside at some point? May I ask why you've been keeping these deciduous trees inside?

two further thoughts ...

if rather new to you.. they came on the plant.. which would make the seller suspect ...

indoor plants.. can not be taken outside and immediately left in sun ... they will burn ... they would need to be hardened off to full sun ... plus a tree in a black pot in sun.. is often.. not good.. the pot/media can get too hot ...

ken

First time posting... Wow what a great forum!

Jean: Thanks! I'll try getting a better shot, but I think you are right about the aphids. Water blasting seems to have taken care of 90% of them. Will do that with manual inspection for the next couple of days.

Rhizo: The tree was outside but it was getting sun burned so we moved it to a shadier sun room. Probably will leave it out for the winter and find a permanent spot for it outside.

Ken: Thanks for the tips. I found a shady spot so hopefully it will be okay. You are also right about the pot being black. I'll look for a nice pot as well.