b'2021 NPPGA Virtual Research Reporting ConferenceThe2021NPPGAResearch susceptibilitytoVerticilliumwilt 2020SupportofIrrigatedPotatoReportingConferencewasheldon intofumigatedandnon-fumigated ResearchforNorthDakotaandTuesday,February16thvirtually soilsatthreeplantingdates.The Minnesota becauseofCovid19.Dr.Andy trial was conducted in west-central Dr. Julie Pasche, NDSURobinson,ExtensionPotato Minnesotaunderirrigatedcondi-Agronomist,NDSU/UMNhosted tions. Verticillium wilt severity, total NorthDakotaStateUniversityhasthe event. andmarketableyield,tubergrade conducted irrigated potato researchand processor return estimates were forover30years.Overthattime,AdjustingPlantingDateforthe differentiallyaffectedbycultivar, growers have become accustomed toManagement of Verticillium Wilt. plantingdateandfumigation. the wealth of information generatedDr. Julie Pasche, NDSU Whiletotalandmarketyieldwere in the areas of cultivar development,reducedasplantingdateswere generalmanagementpracticeslikeVerticilliumwiltarguablyisthe pushedlater,Verticilliumwiltwas vinekill, herbicide efficacy and dam-most damaging disease of potatoes also reduced. In the single year trial age, nutrient management, physio-when considering reduced yield and results reported here, the reductions logicaldefectslikesugarendsandqualityandtheincreasedcostof in yield and adverse effects to tuber disease management, among others.control, and the industry is looking size profiles are not a good trade-off Specifically, trials conducted at thefor sustainability in production. The for the Verticillium wilt reductions irrigatedresearchsitenearInkster,availabilityofcultivarswith observed.However,diseaseevalua- NDhavegivenusawaytotrackVerticillium wilt resistance has been tionswerecutshortduetofrost resistancetoQoIandSDHIfungi-increasing, with several new options damage and disease likely advanced cides in the early blight and brownavailabletogrowers;however,sus- pastthetimewecouldaccurately spotpathogensintheregion.WeceptiblecultivarslikeRusset measure.Thisissupportedby also have evaluated foliar and seedBurbankarestillgrownacrossthe observed increases in total and mar- treatmentfungicidesinaprogrammajorityofUSacres.Previous ket yield (including size profile) in approach specific for the pathogensresearch has supported management response to fumigation. Stem colo- andenvironmentalconditionsinpracticestoreducetheeffectsof nization by V. dahliae is being eval- this region and conducted demon-Verticillium wilt, but we feel there is uated to verify our hypothesis. This strationplotsforthegrowers,room for additional gains in using report includes a single year of eval- amongotherthings.Again,allow-othermanagementpractices.Seed- uation.Inthesecondyearofthis ing us to make timely and relevanttubersplantedintocoldersoils trial, planting dates will be initiated growerrecommendations.Withoutemergemoreslowlywhencom- earlier to more effectively evaluate if the Inkster site, our ability to reactparedtoalaterplantedcrop.Our this can be used by growers to man- to changes in management for irri-hypothesisisthatacropplanted ageVerticilliumwiltinfieldswith gated potato productions conditionsintocoldersoilsalsosuffers high pathogen levels or where sus- inourregionwouldbeseverelyincreasedlossesfromVerticillium ceptiblecultivarslikeRusset impeded.Ifyouhaveutilizedrec-wilt. This hypothesis was tested by Burbank are planted. ommendationsfromNDSUforplantingthreecultivarsvaryingin managingyourirrigatedpotato20 POTATO GROWER MARCH 2021'