b'Blackspot and Shatter Bruise Evaluations5.04.54.03.53.02.52.01.51.0Blackspot ShatterFigure 1.Blackspot and shatter bruise evaluations for advanced fresh market selections and cultivars, Crystal, ND, 2021.The trial was planted on May 25, vines shredded on approximately September 8, and harvested with a single-row Grimme harvester on September 18.A randomized complete block design was utilized with four replicates.The plots were 20 feet long, with a 12-inch with-in row spacing, and 36 inches between rows.Blackspot bruise potential was determined by the abrasive peel method (Pavek et al. 1985) following storage at 45F, using a scale of 1-5, 1 = none, 5 = severe.As an example, Ranger Russet, a highly susceptible cultivar, typically rates as a 4.0 or greater.The mean for blackspot was 2.1, with a least significant difference (LSD) of 1.1.Shatter bruise is evaluated using a bruising chamber with digger chain link baffles.Tubers are stored at 45F prior bruising.Shatter bruises are rated on a scale of 1-5, with 1 = none and 5 = many and severe.Mean shatter bruise was 1.8, with an LSD equal to 0.6.22 POTATO GROWER APRIL 2022'