A yield trial was conducted with diploid potato breeding lines for three consecutive years to test whether these genetic resources could be suitable as diploid cultivars in contrast to the tetraploid cultivars. A plot size of 10 single hills/replication with three replications was employed using a completely randomized block design at Lima in an irrigated desert field. The trial was from 1991 to 1993 in "winter season" (June to September) at Lima with a growing period of ninety days. Single-hill means were used for a two-way analysis of variance for years and for genotypes. Although a variation existed among years, some diploid genotypes dernonstrated significantly higher yields than tetraploid check varieties. Considering ethnic attractiveness and potential for culinary quality as well as adaptation and yield components, some of the diploid breeding lines tested could be used as diploid cultivars to fulfill demands of local ethnic markets.