Insect ID help needed
I have an infestation of some kind of insect on my Plumeria. (Please see the pictures below.) It seems the babies are white, and the adults are a light gray. They leave a cottony substance on the underside of the leaves. It's not white fly ... I looked that up and the bug is different. Can any one tell me the name of it, and how to get rid of this. There is also a spider on one of the plants, and a strange bug on another. Can anyone ID those, too, and are they harmful to plants? Thank you!