Apparently it overwinters as an adult and actually does much of its damage during the winter. Ovoviviparous females, both winged and wingless, form the bulk of the population. Males are rarely found, and no eggs have ever been seen. This suggests that the aphid can reproduce parthenogenetically. The female aphids are found in large clusters on the leaves, where they feed and reproduce.
Reproduction slows down in winter and summer and is most rapid during cool weather.
Therefore, corn leaf aphids tend to be a problem on winter grains in fall, on warm winter days, and in spring. The number of generations per year varies from 9 in Illinois to 50 in southern Texas. Pasturing infested winter barley is recommended to free the crop of this pest. For further control recommendations, consult the current North Carolina Agricultural Chemicals Manual .