Abstract
With 4 figures and 1 table Abstract The purpose of this research was to evaluate the efficacy in tubers of a late blight resistance gene, RPi-ber, originating from Solanum berthaultii. Experiments were conducted in the field and laboratory. Inoculation of tubers in field trials occurred via sporangia produced on infections in the foliage. Laboratory trials were conducted by inoculating whole tubers and tuber slices with sporangia of Phytophthora infestans. In all trials, those progeny with RPi-ber were essentially immune to strains of P. infestans that were incompatible with RPi-ber in the foliage. However, even when tested against strains of P. infestans that were compatible with RPi-ber in the foliage, there was still a resistance effect at the RPi-ber region.
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