Studies on the aphid, Aphis craccivora, Koch. (Homoptera: Aphididae) in Egypt.
The seasonal abundance of aphids infesting cowpea [Vigna unguiculata] was studied in Egypt in 1985-86. Three species, Aphis craccivora, A. gossypii and Acyrthosiphon pisum, were found infesting cowpea, but Aphis craccivora proved to be the most damaging species. The highest numbers of individuals of A. craccivora were recorded at the beginning of the season, which was suggested to be due to their migration from other food plants. The pest was found from mid-May to the end of September, reaching a peak in occurrence in mid-July. Parasitism of the pest by a species of braconid occurred in June and July and reached a peak in July (10%).