b'conditions.Total yields significant- gramfocussesprimarilyonbright 45F.Ratingsforentrantsrangedlydiffered,rangingfrom150 red-skinned genotypes; many of the from 1.4 to 3.1; proper tuber hydra-cwt./acreforND1241-1Yand 2018entrieshadsuperiorcolor tion and using bruise-free manage-ND12128B-1R, to 300 cwt./acre for compared to industry standards Red menttechniqueslimitshatters.Gala(Table2).YieldofAsized Norland,RedLaSoda,RedPontiac Shatterbruisesmayserveastubers (US No. 1s) ranged from 11 andSangre.Nohollowheartor entrance points for pathogens suchcwt/acreforND13193B-1R,to160 brown center were found, thus data asFusariumspecies.Finally,thecwt/acreforND13179CB-1R. for these internal disorders are not general rating score is a reflection ofPercentageAsizerangedfrom6% reported.Specificgravitydiffered many characteristics including totalforND13193B-1R,to59%for significantlyforclones,ranging yield, tuber size profile, tuber shapeND13179CB-1R,DakotaRose,and from1.0773forSoraya,ayellow andcolor,internalandexternalRed Norland.Both A sized yield and fleshed cultivar with waxy flesh tex- defects,andfreedomfromdisease,percentagedifferedsignificantly ture,to1.1083forND13241C-6R, in essence the breeder merit score.across clones.Due to industry inter- indicatingfleshwithadry,mealy Thegeneralratingscoresrangedest in genotypes with a higher tuber texture.Thislatterclonehas from 2.6 for Red Pontiac, to 4.3 forsetandsmallertubersizeprofile, ColoradoPotatoBeetleresistance ND102990B-2RY,anddifferedsig-clone performance tended to mirror breedingandthesourceofthat nificantly across the entries.Manythat market attribute, but were also resistancetendstohaveveryhigh entries were standouts in the trial,influencedbythedroughtcondi- specific gravity.These elevated spe- includingND6002-1R,ND081571-tions.Thepercentageof0to4- cific gravities are also due to the dry 2R,ND081571-3R,ND102663B-3R,ounce size tubers ranged from 18% growingconditions.Trialentries ND102990B-2R,ND1243-1PY(pur-forRedNorlandto94%for wereevaluatedforblackspotand ple skin and yellow flesh), ND1382-ND13193B-1R.Thepercentage shatterbruisepotential.Blackspot 2R, and ND13236C-10R.tubers4-6ouncerangedfrom6% bruise results when polyphenol oxi-forND13193B-1Rto44%for daseandtyrosinecombinewithin ThankyoutoDaveandAndyND6002-1RandND1243-1PY, damaged cells due to tubers bump- Moquistforhostingthisresearchreflectingtheoverallsmallertuber ing around during harvest and han- trialandourfreshtrialsite.Thesizeprofile.Oversizetubers(>10 dling operations.Typically, the skin NDSU potato improvement team isoz.) were most prevalent for indus- is not broken and bruises are diffi- grateful for the opportunity to con-trystandardssuchasRedLaSoda, culttodetectwithoutpeeling. ductcooperativeandinterdiscipli-RedNorland,andRedPontiac. Blackspotbruisepotentialdiffered naryresearchefforts,andforourTubers were generally graded as US significantlyacrossthegenotypes, manyproducer,industry,andNo.2sorcullsduetomisshapen ranging from 1.4 to 3.8.Producers researchcooperatorsinNorthtubers. should use management practices to Dakota,Minnesota,theNorthmaximizethemarketingofbruise- Centralregionandbeyond.WeFreshmarketqualityattributes freetubers,includingpre-harvest appreciate the support provided byinclude tuber shape and color, inter- irrigation if possible, maintain belts the Northern Plains Potato Growersnaldefects,specificgravity,and and conveyors full of tubers and soil Association,theMinnesotaAreaIIbruise potential (Table 3).Shape of asthepotatoesmovethroughthe PotatoResearchandPromotiontubers varied from round, to elon- harvester,limitdrops,andutilize Council,JRSimplotCompany,gate for All Blue.Color ranged from paddingonharvesters,intrucks, USDA-NIFA, amongst many others,yellow for ND1241-1Y, Gala, Soraya, andonconveyorsgoingintostor- in providing resources of land, certi-andYukonGold,topurplefor age.Shatterbruisepotentialwas fiedseed,researchfunding,andND1243-2PY and All Blue.Our pro- alsoevaluatedfollowingstorageat equipment resources.APRIL 2019 POTATO GROWER 11'