Hi everyone!
I have a young plumtree and this year there are a lot of small larvae on leaves, especially eating young leaves.
They seem to start shaped like tiny white grasshoper-style, then evolve into greenish walking insects. There are also small black flies, I can't tell for sure if they're the same species.
What can it be?
I've looked at databases and thought it could be whiteflies but they don't really look lie the same shape.
See photo:
Any help welcome!

We have the same issue, did you discover what these irritating lil bugs are???

Perhaps aphids or mealy bugs? I spray most tiny insects with Neem Oil spray as my first line of defense. If that doesn't get the critters, I seek further assistance here on the forums. Be sure not to spray Neem Oil when the sun in on your plants or it will scorch the plants. I burned up some asters one time not knowing this. Best to spray in the evening when sun is off of them.

If somebody else has the same issue, those are Wooly aphids.