That looks like a whitefly to me. I think it's a great picture btw.

I have never had to deal with them so rather than quote you something I don't know works for sure, I'd suggest you do a search for whiteflies on here and see what others have had success with.

Wierd, but i read that they are attracted to the color yellow. Might be a neat experiment to put something yellow with some tanglefoot or something on it and see if you can catch the buggers.