b'2020 Larimore Processing Trial Summaryby Dr. Asunta Susie Thompson, NDSU Potato BreederPotatoisaprincipalandsignificant Twenty-fourdual-purposerusset/long ND12162AB-1Russ to 556 cwt/acre forhorticultural crop across the Northern whiteselectionsandcultivarswere ND14286BC-11Russ(Table2);thePlainsofNorthDakota(ND)and included in the trial planted on May mean was 363 cwt./acre across the 24Minnesota(MN).NorthDakota 27, 2020.The field plot design was a entries.This was a new pivot so ourranked third in US acres harvested in randomized complete block with four first experiences and we did plant later2020atapproximately77,000acres replicates.Cultural practices typical of in May than generally, and of course(+31,130 ha), and production value for thegrowingareaforRussetBurbank wanted to avoid harvesting in Octoberthe 2019 crop exceeded $223M (NASS were used during the growing season, as wed experienced snow and freezing2020), making it fifth for value among includingsprinklerirrigation;rows temperatures in early October the pre-all crops in ND. Approximately 60% of were 36 inches apart, with a 12-inch vioustwoyearshamperingand/orthe Northern Plains potato production within-row spacing.Vines were flailed endingharvest.YieldofUSNo.1is for processing, primarily for French immediatelypriortoharvest tubersdifferedsignificantlywithafries and other frozen products.Potato September23;daystoharvestwere rangefrom125cwt./acreforbreedingresearcheffortsfocusedon 119. ND12162AB-1Russ to 497 cwt./acre fordevelopment and release of improved ND14286B-11Russ, while the percent-processingcultivarsprimarilytakes Agronomicevaluations,yieldand age of US No. 1s ranged from 57% forplace at irrigated sites in ND and west- grade, and quality attributes are sum- ND12162AB-1Russto91%forRusseternMN,predominantlyatgrower marizedinTables1,2and3.Vine Norkotah, with means of 279 cwt./acrehosted field sites.The improvement sizes differed significantly, as expected, and 76%, respectively.The percentageteamconductsbreeding,germplasm and ranged from medium-small (scale of 6 to 10-ounce size tubers for clonesenhancement,selection,disease of 1 to 5 with 1 being very small, to 5 ranged from 9 to 21%, with a high per-screening and agronomic evaluations, being very large) for ND14261B-2Russ centage of tubers in the 10 oz. sizein its efforts to identify and develop andND14266AB-1Russtolargefor category.Percentagetubers10superiorcultivarsforproducerand CalWhite(Table1).TheNorthern ouncesrangedfrom12%forindustryadoptionaddressingshort- Plains experiences short growing sea- ND14286BC-2Russ and Alturas to 56%comings of current cultivars including sons, thus, early maturation is impor- forRussetNorkotah.Percentagein areas of sustainability and quality. tantforproducers;vinematurities tubers in the 4-6 ounce grade rangedThese collaborations include research rangedfrom1.0(veryearly)to2.9 from 13% for ND050032-4Russ to 43%andindustrypersonnelatNDSU, (medium),withameanof2.1,for forMN13142.ND14286BC-2Russ,UMN, and other North American pro- ND14266AB-1RussandRusset RussetBurbank,andUmatillaRussetgrams,theNorthDakotaStateSeed Burbank,respectively.Thematurity produced more than 20% undersizedDepartment,theMinnesota rating for Russet Burbank was earlier (0-4 ounce) tubers.ND050032-4RussDepartmentofAgriculture,andwith than an average of 4.0 over the many andND12162AB-1Russ,Russetcertified seed and commercial potato years of trialing at Larimore.Tubers Burbank and a Proprietary Russet pro-producers. per plant differed significantly with a duced high percentages of US 2s andrange from 4.0 for ND050032-4Russ to Culls due to misshapen tubers, tubersThis summary reports the results from 10.4forND14286BC-2Russ,anda withsecondgrowth,andgrowththe2020LarimoreProcessingTrial. meanof6.3;RussetBurbankhada cracks.SincerethankstoHoversonFarms mean of 7.0 tubers per plant. (Carl, Michael, Casey and all) for host- All entries had acceptable French frying this trial and for development of a Total yields differed significantly, rang- color when fried at harvest (field fry),second minipivot for potato research. ingfrom219cwt./acrefor includingRussetNorkotahourpoor24 POTATO GROWER JULY/AUGUST 2021'