Did you do any preventive spraying on the trees? If not you are going to need to play catch up. Take a couple of the leaves and a bug (in a baggie) to a real nursery and get some solid advice on what you should spray the tree with. Good luck.

the white bugs look like aphids, ants like the sticky stuff aphids excerete...the red beetle looks familiar, I've had that one in my yard before, i'll try to remember what is is