100 80 60 40 20 a 8.0 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0.0 b ef d bc c Bud Harvest 1 2 bc ef de ab Stem 3 4 Month Figure 2. Tubers impacted at harvest (45°F) and impacted each month in storage (45°F): Effect of tuber end and evaluation month for bruise susceptibility a) blackspot bruise incidence and b) blackspot bruise depth and c) shatter bruise incidence. Results are means of two years and combined between cultivars. Values followed by the same letter are not significantly different (α<0.05) for each graph. Where else can you find industry suppliers? 5 6 7 8 bc bc abc a de d c c bc ab b b a Bud Harvest 1 2 Stem 3 4 Month h f f g f d 5 6 7 8 a d d de d d de e c increase was primarily observed on the stem end of the potato. The bud end had minor fluctuations in blackspot bruise incidence and depth during each month of storage, but by the eighth month susceptibility was similar to tubers impacted at harvest (Figure 2). Even though tuber ends responded differently to impact at different times in storage, overall blackspot bruise susceptibility was consistent throughout storage. The longer the duration in storage, the less chance of subsequent shatter bruising to occur during handling (Figure 3). Overall, a decrease in shatter bruise incidence was seen by the seventh month in storage. Shatter bruise was routinely accompanied by blackspot bruise throughout this study (data not shown), emphasizing that potatoes impacted during handling may encounter both types of bruises, so understanding the risk for both bruises is beneficial. Based on these two studies, we can conclude that bruises sustained at harvest do not dramatically change in storage for Russet Burbank and Russet Norkotah. There is a potential for slightly higher blackspot bruise to be observed after storage compared to at harvest. Sub-sampling early in storage The 2022 Buyers' Guide is your year-round resource Whether you are out on the farm or in your home, you can easily find the suppliers you need to keep your operation running. Keep the 2022 Buyers' Guide handy! INSIDE DIRECTORY OF INDUSTRY SUPPLIERS BY CATEGORY SEPTEMBER/OCTOBER 2021 THE MOST TRUSTED VOICE IN THE POTATO INDUSTRY 2022 BUYERS' GUIDE View the Buyers' Guide at Spudman.com/BuyersGuide 24 Spudman.com Blackspot bruise depth (mm) Blackspot bruise incidence (%)http://www.Spudman.com/BuyersGuide http://www.Spudman.com