One of the attack plans we had, in dealing with the aphid problem, was to bring in a commando force of ladybugs from our front yard.
They immediately began attacking (i.e., eating) the aphids. After satiating themselves, they began procreating.
Within only a few short weeks, the aphid infestation has been reined in, and most of the affected plants are back to producing vegetables.
In researching which insects are friends of the gardener, I noted another friend, the Syrphid fly, whose larva also feed off of juicy aphids. Not unexpectedly, I found many a syrphid fly hovering about our zucchini plants.
All photos © 2008 A. R. Lopez.