Approximately 5-10 days later repeat the spraying this should kill most of the newly hatched eggs and remaining adults. A third treatment is just to be safe and kill any survivors that may remain. In 5-10 days following your third treatment check your plants thoroughly for any remaining diehards, and spray any spotted, as well as, the area surrounding it. For their best effectiveness they should be placed out at the first sign of aphids on your plants. The two insects that are most used for aphid infestations are lacewings and lady bugs.
Lacewings are the most menacing predators for aphids.
They are released at a rate of 1-20 lacewings per plant, depending on your infestation size. After you have reduced your infestation to minimal levels, place lacewings out at about 1-5 per plant every month there after until harvest. If adult lacewings are available, they are preferred over the larvae. Larvae take time to grow into adults and the aphids can devastate a garden in a matter of days. Lady bugs are also an excellent, and easy to obtain exterminator of aphids.