This is the first infestation of spiral whitefly I have seen on my crotons....ever. I am battling it on virtually every palm in my collection, and now it's jumping to crotons. I venture to say, it will be on every broad leafed plant in time. My neighbor has seen it on his heliconia, cordyline, philodendron, and even bromeliads.
I have just ordered a huge shipment of green lacewing, a natural predator. I hope that those guys will take care of it.
Have you seen whitefly on your crotons or palms yet??