Yellow_Hibiscus,
I had a similar infestation on one of my CVs this winter. I have delt with aphids many times in the past and I do not believe this is aphids. You seem to be dealing with a more advanced attack than I had. As with yours, I saw the majority of the damage around new growth and buds. Ultimately, I think you may need to entertain the idea pruning the infested areas. With my first outbreak I tried drowning, this was now effective. Next I used a pesticide, but the outbreaks started elsewhere on the plant. Finally, I cut away the infected areas, and have yet to have an outbreak since. Currently the plant does have an ugly apearance, but when I do a serious prune in a month, it will be ok.
Hope this helps,
Ed

Hi,
That looks like what I have on one of mine. Or had I should say. I sprayed it with Organocide. It stinks bad but it seems to work. I have an infestation on another plant but the ants are working on them so I didn't spray it.
I think that one might drop it's leaves too as the one I posted about earlier. When that happens I won't have to worry about it anymore.

Thanks to both of you for your advice-- I've soaked the plant in a homemade organic insecticidal soap, and now I will be taking Gutzmek's advice and pruning the plant down to just the major central stem-- most of the buds/leaves have been infested and I just can't get to all the eggs/bugs off as they tend to hide in small crevices. Eek!
I was also thinking of leaving it outside today or tomorrow when the temp will fall into the 20-30 degree range, to freeze out the little buggers. Good idea? Bad idea?

This might do permanent damage to the plant. I would use caution with this method. Many times the bugs will survive longer than the plant.
Ed

This post was edited by Gutzmek on Mon, Feb 25, 13 at 18:58

I wouldn't withhold spraying because of the ants, which are actually farming the aphids for their honeydew, not eating them.
The ants will actually protect the aphids from predators, too.
Icing the hibiscus, bad idea.
You'll harm the plant, not the aphids.

I have soaked the plants and the area around the plants with water and dish washing liquid it kills all the ants and aphids that it touches. So it is only a contact protection. I would never do this during summer day times as it would burn the plants.