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Previous research suggests that extant potato cultivars offer little promise as sources of useful aphid resistance. However, few prior studies have critically measured the effects of host cultivar on aphid age-dependent life table statistics or related these measures to field performance. Therefore, a comprehensive field and greenhouse study was undertaken to assess 49 commercial potato cultivars, primarily of North American origin, for resistance to green peach aphid,Myzus persicae (Sulzer), and potato aphid,Macrosiphum euphorbiae (Thomas). Cultivars were found to show considerable differences in resistances to each aphid species, but these resistances were not significantly correlated (R ² =0.032). In greenhouse life table studies, the intrinsic rate of increase (r _m) of green peach aphid was lowest (0.167) on cv Russet Norkotah and highest (0.350) on cv Red La …