b'bygreensprouting(chitting),using shape and color, internal defects, specif- vester,limitingdrops,andutilizingproducts such as gibberellic acid, plant- ic gravity, and bruise potential.Tuber padding on harvesters, in trucks, and oning in beds using a higher plant popula- shapevariedfromroundformost conveyors going into storage.tion,orbytighteningupthewith-in entries, to oval and oblong for selectionsrowspacing,rowspacing,orboth. AND00272-1RandND1393Y-3Rand Finally, the general rating score reflectsTuber number per plant differed signifi- several industry standard cultivars.Skin manycharacteristicsincludingtotalcantly, ranging from 3.8 for ND6002-1R color ranged from yellow for ND1241- yield, the tuber size profile, tuber shapeto 15.0 for ND113091B-2RY. 1Y, Gala, and Yukon Gold, to splashed and color, internal and external defects,for ND1212-1RSY and ND1394B-1RSY. andfreedomfromdisease,inessenceAs in 2018, reduced yields and a smaller the breeder merit score.General ratingtubersizeprofileresultedfromthe A primary emphasis of our program is scores differed significantly and rangedextremely dry summer 2019 conditions. on bright red-skinned genotypes; many from2.8forRomanze,to4.3forTotal yields significantly differed, rang- of the 2019 entries had superior color ND102663B-3R.Manyentrieswereing from 106 cwt./acre for ND1240-2R compared to the industry standards Red standoutsinthetrial,includingto 260 cwt./acre for Red LaSoda (Table Norland, Red LaSoda, Red Pontiac and AND00272-1R,ND081571-2R,2).Yield of A sized tubers (US No. 1s) Sangre.No hollow heart or brown cen- ND102663B-3R, ND102990B-2R, ND102ranged from 9 cwt/acre for ND1240-2R, ter were found, thus data for these inter- 990B-3R,ND1232B-2RY,ND1241-1Y,to151cwt/acreforRedNorland. nal disorders are not reported; this is not ND12128B-1R,ND1382-3R,amongstPercentageAsizerangedfrom5%for unexpected when environmental condi- others.TheseclonescontinueintheND102990B-2R a beautiful high setting tions are uniform throughout the grow- pipeline progressing through evaluationselection, to 68% for Red Norland.Both ing season, albeit dry.Specific gravity inanticipationofrelease.AdditionalA sized yield and percentage differed sig- differed significantly for clones, ranging trial and data summaries will be submit-nificantly across clones as expected, due from 1.0674 for ND1382-2R, to 1.1044 ted for upcoming inclusion in the Valleytoourselectionresponsetoindustry forND1241-1Yadual-purposeyellow PotatoGrowermagazineand/ormadeinterest in genotypes with higher tuber selection(freshandchipprocessing). availableonthepotatobreedingweb-setandsmallertubersizeprofiles,in Elevated specific gravities are often the page (https://ag.ndsu.eduplantsciences).additiontoinfluencebythedrought result of excessively dry growing condi-conditions.The percentage of 0 to 4- tions.Blackspotbruisesresultwhen Wewouldliketoexpressoursincereouncesizetubersrangedfrom4%for polyphenoloxidaseandtyrosinecom- thanks to Dave and Andy Moquist forND13140B-3R to 93% and 94% for the bine within damaged cells due to tubers hostingthisresearchtrialsite,thehigh setting selections ND102663B-3R, bumpingaroundduringharvestand NorthernPlainsPotatoGrowersAsso-ND102990B-2RandND102990B-3R. handlingoperations;generally,tuber ciation,theMinnesotaAreaIIPotatoThe percentage tubers 4-6 ounce ranged skin is not broken making bruises diffi- ResearchandPromotionCouncil,JRfrom 5-6% for many of the high setting culttodetectwithoutpeeling. SimplotCompany,USDA-NIFA,red selections, to 48% for Dakota Rose. Blackspotbruisepotentialdifferedsig- amongstmanyothers,inprovidingOversize tubers (10 oz.) were very low nificantly across the genotypes, ranging researchfunding,certifiedseedandandweremostprevalentforindustry from 1.3 for Gala and Sangre, to 3.4 for equipment resources.standards including Red LaSoda and Red ND1232B-2RY.This latter selection is anNorland, and ND6002-1R.Tubers were attractive red with rich yellow flesh and We are grateful for the opportunity togenerally graded as US No. 2s or culls (% good flavor.Management practices to conductcooperativeandinterdiscipli-DefectsinTable2)duetomisshapen maximize the production and marketing nary research, and for our many produc-tubers. of bruise-free tubers include pre-harvest er, industry, and research cooperators inirrigation if possible, maintaining belts NorthDakota,Minnesota,theNorthFresh market quality attributes are sum- and conveyors full of tubers and soil as Central region, and beyond.marizedinTable3,andincludetuber thepotatoesmovethroughthehar-APRIL 2020 POTATO GROWER 11'