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- Author or Editor: Richard K. Peasah x
- HortScience x
External bruising to potato tubers can result in a blue-black discoloration in the tuber flesh called potato blackspot (PBS). Three potato cultivars used in the Minnesota chipping industry (Atlantic, Frito Lay 1533, and Norchip) were tested for their susceptibility to PBS and compared to Russet Burbank. Tubers were bruised on the stem end using a spring-loaded bruiser and stored at 10°C from 1 to 3 days. PBS was evaluated 24, 48, and 72 hours after bruising. Percentage of bruised tubers showing PBS and Hunter L values of the bruised flesh were used to assess susceptibility. Percentage data showed that the order of most to least susceptible to PBS was Atlantic > Russet Burbank ≥ Frito Lay 1533 > Norchip. L values were not indicative of percentage of tubers showing PBS and may not be accurate measurements of susceptibility to PBS. Atlantic and Russet Burbank tubers were also bruised and stored at 25°C to determine whether a higher storage temperature affected PBS development Atlantic tubers stored at 25°C showed less PBS than those stored at 10°C at each evaluation time. Russet Burbank tubers stored at 25°C exhibited less PBS than those at 10°C at 48 and 72 hr after bruising but not at 24 hr.