I have had a consistent problem with Croton Scale on a few of my plants. They were small plants and isolated from other crotons so I was not too concerned. I would spray a hose on them once in a while, blowing off most of them. This past week I noticed the scale were all deader than a door nail, all dried up and flaking off. In their place, however, was a smaller infestation of mealy bugs. What happened? Are mealy bugs territorial? Are they part time scale predators? Did a new species of ants kill all the scale and move in their own white flock of mealy bugs? Anybody ever see this before?