Whatever these were before they became these destroyed half of my snowball shrub. It was suggested that the original larvae were viburnum leaf beetles - that's what they looked like a few weeks ago (small & brown) - but I have also seen pictures of cottony cushion scales that look a lot like these, but they don't eat leaves so I'm confused unless I'm looking at two different pests. The remaining leaves (the ones that aren't all meshy) are all shiny and sticky - like slugs have been on them. The pupae, if that's what they are, are hidden on the underside. They are immobile and a little squishy and really stuck to the leaves.