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M A Y J U N E 2 0 1 6 POTATO GROWER 21 Total yields differed significantly as expected ranging from 198 cwt. acre for ND113338C-3R to 420 cwt.acre for ND113207-1R Table 2. Yield of A-sized tubers ranged from 9 for ND113338C-3R to 263 for ND113089B-2RY while percent- age A-sized tubers ranged from 4 for ND113338C-3R to 70 for ND7132-1R. Due to a more normal growing season late April through mid-September the tuber size pro- file for all clones tended to be excel- lent and because of the fresh market desire to limit oversized tubers vine kill was done on September 1. Many genotypes have been selected for an increase in tuber number per plant and the propensity to produce B and C sized tubers. Many selec- tions had small tuber size profiles with an excess of 50 in the 0-4 ounce category and many exceeded 40 in the 4-6 ounce tuber size cat- egory. ATND99331-2PintoY ND 6002-1R Dakota Rose Red LaSoda and Viking produced the highest percentages of 6-10 ounce tubers as well as oversized tubers. There were few US No. 2 tubers from the trial as well as culls with the exception of Viking and Red LaSoda. Both tend- ed to have more external defects such as growth cracks misshapen tubers and deep or protruding eyes. Clones were rated for scab and scurf during grading. There was very lit- tle scab and the few tubers with scab had surface or pit scab. Scurf was more widespread through the trial. All Blue Red Norland Sangre and Viking had the most scurf. ND102663B-3R ND6002-1R ND 102990B-3R ND113338C-3R Dak- ota Ruby ND081571-2R and -3R amongst many others had little scurf silver scurfblack dot. Trial entries were evaluated for internal defects. There were minimal inter- nal defects including internal brown spot 0 vascular discoloration range of 0-20 but most clones were 0 and hollow heartbrown center Table 3. Percentage hollow heartbrown center ranged from 0 to 5 Yukon Gold. Trial entries are also evaluated for blackspot and shatter bruise potential. Blackspot bruises result when polyphenol oxi- dase and tyrosine combine within damaged cells due primarily to rough handling of tubers during harvest and handling operations. The skin is generally not broken and bruises are difficult to detect with- out peeling. Blackspot bruise scores rated from 1.2 to 4.3. Dakota Ruby and Sangre rated as a 1.4 on our scale of 1 to 5 using the method of Pavek and Corsini where tubers from 45F storage are peeled using an abrasive peeler and held overnight at room temperature discoloration on the stem end is then rated for coverage and intensity. Based on our ratings and granted we dont always have belted or padded chains we harvest into burlap and move them from pallets a few times before grading and storage produc- ers should always use best manage- ment practices to maximize the marketing of bruise-free tubers including a pre-harvest irrigation if appropriate maintain belts and conveyors full of tubers and soil as the potatoes move through the har- vester limit drops and utilize padding on harvesters in trucks and on conveyors going into stor- age. Shatter bruise potential was evaluated following storage at 45F. The range was 2.3 to 4.4 with a mean of 3.2 across the trial. While no clone stood out as having signif- icant potential for shatter keeping tubers properly hydrated using bruise-free management techniques and minimizing damage limits shat- tering. Shatter bruises may be a pos- sible entrance point for pathogens such as Fusarium graminearum Fusarium sambucinum and Fusarium coeruleum creating a potential prob- lem in storage or in marketing. There are many very promising advancing selections in our breed- ing program and all NDSU selec- tions had a general rating signifi- cantly higher than Red Norland Sangre or Red LaSoda. Please see Figures 1-3 for specific summaries for a few of these outstanding lines. The NDSU potato improvement team wishes to express our gratitude to Dave and Andy Moquist O.C. Schulz for hosting this research trial. Thanks also to Duane Bernhardson and the group at KWS for allowing us to trial their clones Abby Mondeo and Vitabella and for supporting our research efforts. We are particularly grateful to the Northern Plains Potato Growers Association and the Minnesota Area II Potato Promotion and Research Council for funding to conduct research in North Dakota and Minnesota. We are appreciative of the opportunity to perform cooper- ative and interdisciplinary research efforts and are grateful to our many grower industry and research coop- erators across North Dakota and Minnesota and beyond for support of our research programs including funding certified seed potatoes and inputs.