Abstract
The Colorado potato beetle {Leptinotarsa decemlineata Say) is the most destructive insect pest of the potato {Solcamm tuberosum L.) worldwide and has shown remarkable adaptability to insecticides. In wild Solamm species, the best known host-plant resistance mechanisms are a high level of foliar glycoalkaloids and the presence of specialized, glandular trichomes. Through a preliminary field-test screen, three Solamm species, Solamm trifidum, S. raphanifolium, and S. circaeifolium, were identified with low foliar glycoalkaloid levels and no glandular trichomes, but still exhibiting substantial resistance to L decemlineata. These three species along with two species, S. berthaultii and S. chacoense, representing the two
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