New Record of Black Bean Aphid, Aphis fabae Scopoli, on Broad Beans in Osaka Prefecture

Abstract

The occurrence of the black bean aphid, Aphis fabae Scopoli (subsp. fabae) was observed on broad beans in Osaka Prefecture. Since the first record of A. f. fabae in Japan (Hokkaido Prefecture) in 1994, its distribution has not been reported in the western part of Japan. The offspring of parthenogenetic females collected in Osaka Prefecture did not produce any sexual forms under the short day-length (8L16D, 12L12D) and low temperature (10°C, 15°C) conditions which induce sexual generation of this species with holocyclic life cycle. So it was supposed that the aphids of Osaka Prefecture belong to the anholocyclic population. This aphid could be reared on Visia faba, Phaseolus vulgaris, P. angularis, Pisum sativum, Beta vulgaris, Rumex obtusifolius but not on Trifolium repens.