Mites, or something of the sort on Hibiscus

[JScott]

I know a Hibiscus isn't an orchid, but I thought this was the best forum to post this in. I water my Hibiscuses every day, and I inspect them every day watching for open flowers and new buds and such, so whatever happened to this one happened fast, because I only noticed it tonight, and it is covered.

My first thought was whiteflies, but that doesn't seem right. They don't seem to fly. But if you run your finger along an infested leaf, it leaves a greasy smear on your finger. I've never seen anything exactly like this.

Anybody know what it is? I'm sure I can treat it with any broad spectrum pesticide. I try to avoid chemicals in my garden, but sometimes, you have to make an exception. I love my Hibiscus, and i need these guys to be dead. It looks like they are starting to deform the flower buds.

I guess I could try horticultural oil first in order to be ecologically sensitive, but I feel more like I'd rather kill them with toxic gas, if I could. Or fire. Anybody have any ideas on what they are or how best to eradicate them?