The good news is that the aphids don't seem to be interested in any of the other plants in the yard. They cling to and coat the bindweed exclusively. You'd think that such a pest might give the bindweed a run for it's money. I only wish that it could. No, bindweed holds its own very well against the aphids' assault.
All the same, it's kind of convenient that the aphids all live on bindweed. It's easy to just pluck the weed, toss it in the compost bag, and have done with two problems in one.