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Resistance to the Colorado potato beetle (CPB) and green peach aphid (GPA) would be valuable if it could be effectively transferred from wild potato species to the cultivated potato. Eighteen diploid interspecific hybrids have been developed using  Solanum tuberosum  Gp. Tuberosum haploids (2n = 2x = 24) and the diploid wild species  S. berthaultii  (ber),  S. chacoense  (CHC),  S. jamesii  (jam), and  S. tarijense  (tar). Twenty-five genotypes per family were screened for resistance to CPB and GPA. Feeding trials were carried out on intact leaves. The degree of resistance to CPB was determined by the stage of instar development and weight of larvae after a four day feeding period; resistance to GPA was evaluated by aphid reproduction and survival after a fifteen day feeding period. Highly CPB or GPA resistant clones, compared to `Norgold Russet',, have been identified thus far. Some clones express high levels of resistance to both CPB and GPA. Crosses between resistant clones and  S. tuberosum  will be carried out at the diploid level in an attempt to combine resistance with good tuberization qualities.

RESISTANCE TO THE COLORADO POTATO BEETLE AND GREEN PEACH APHID IN INTERSPECIFIC SOLANUM HYBRIDS.