Tests of Suitability of Overwintering Hosts of Aphis glycines: Identification of a New Host Association with Rhamnus alnifolia L’Héritier

Eleven species from the family Rhamnaceae, including both species exotic and native to North America, were tested for their acceptability to the fall migrants of the soybean aphid, Aphis glycines Matsumura. Two species, Rhamnus cathartica L. and Rhamnus alnifolia L’Héritier were accepted and had overwintering eggs deposited on them. Eggs survived the winter, and colonies developed on both hosts in the spring. R. alnifolia is a new overwintering host for the soybean aphid.