Organic Aphid Control

All the books claim that it is easy to control aphids. They suggest squishing the bugs or shooting them with a hose. The experts even claim that an aphid will seldom return to a plant from which it has been dislodged.
Well, these organic people have forgotten that ants cultivate aphids in return for the secretions the aphids produce. When a few hundred strong ant colony decides they want aphids on your trees a shot of water or squishing the bugs will not control the problem.