Annoyingly hard to get rid of may be an understatement. They hide under leaves, they're tiny and they hop (well duh!). Making them hard to find, catch and kill. And they can go from a few on your plants, to an army in a week
I shake my plants every morning, to see if I had any new visitors. If you see a bunch of little white dots leaving the plant, when shaking, you may have a case of leaf hopper blues. I caught a few so far this year, but amazingly enough, weekly Don't Bug Me treatments seem to have kept them at bay....so far. I lost a few branches to them last year. They seem to attack where branches meet the stem and tap into the flow of plant juices. Weakening branches that have decent sizes buds growing.
Good luck