b'application of ESN at emergence, (2) ment had the highest tuber specific inanticipationofdecreasingavail-assessthevalueofturkeymanure gravity in this group of treatments.ability and/or efficacy of soil appliedapplied before planting as an organ- insecticides.ic amendment in potato production, Overall,unlikethepreviousyear,(3) evaluate the effectiveness of NNI our results did not support banding Managing PVY Vectors, 2020relativetopetioleNO3Nconcen- ESNatemergenceasasolutionto Dr. Ian McRae, UMNtration as a measure of crop N needs, prill loss from topdress application.and(4)evaluatethepotentialfor Theuseofturkeymanurebefore This is continuing research and out-remote-sensing-basedestimatesof plantingincreasedtuberspecific reachthatexpandsandmaintainsboth NNI and petiole NO3N con- gravity. It may be that regular use of anaphidtrappingandmonitoringcentration to inform N management turkeymanureovermanyyears networkforaphidvectorsofvirusdecisions.Sixteentreatmentswere wouldbegintohaveadditional diseaseinpotatoes(focusingonappliedinarandomizedcomplete effects on potato yield or quality. It PVY)andprovidesnearreal-timeblockdesignwithfourreplicates. is likely that the effects of N man- maps of aphid population distribu-Total,marketable,andU.S.No.1 agementtreatmentswouldbe tioninMinnesotaandNorthyieldswerehighinalltreatments, greaterinafieldoryearinwhich Dakota. This proposal also includesincluding the control, and higher at tuberyieldismorelimitedbythe refiningoptimumtimingforvine-intermediateNrates(140to220 application of N. kill,supplementingasuccessfullbsac-1 total N) than at higher rates Specialty Crop Research Block from(240300 lbsac-1 total N), suggest- ManagementofColoradoPotato the Minnesota Dept. of Agriculture.ing that substantial N was provided Beetle 2020by sources other than fertilizer, such Dr. Ian McRae, UMN Developing Remote Sensing-Basedas soil organic matter and NO3N in YieldMappingTechnologiesForirrigation water. Banded application Thisisaprojecttodevelopand Potato In MinnesotaofESNatemergencedecreased refinemanagementtacticsfor YuxinMiao,DanLi,Shujiangyields,possiblyduetomechanical ColoradoPotatoBeetlesin Kang, Carl Rosen, Sanjay K. Gupta,damage during application or exces- Minnesota and North Dakota. This PrecisionAgricultureCenter,sive fertilizer concentrations close to proposalwillinclude:1)assessing DepartmentofSoil,Water,andtheyoungplants.Turkeymanure insecticideresistanceofadult Climate, UMNincreased tuber specific gravity but Coloradopotatobeetleinhad no other effects on tuber yield MinnesotaandNorthDakotato Accurate high-resolution yield mapsorquality.Thetreatmentsusedto insecticidescurrentlyavailablein areimperativetoidentifyspatialcompare the effectiveness of differ- management, 2) Evaluating the effi- yield variability patterns, determineent measures of plant N status pro- cacyofregisteredinsecticideswith keyfactorsinfluencingyieldvari-ducednearlyidenticalregimensof the addition of Piperonyl Butoxide, ability,andprovidesite-specificUANapplicationsandproduced including the efficacy over 2-3 gen- managementinsightsinprecisionvery similar tuber yield and quality erations, and 3) Evaluate the efficacy agriculture.However,potatoyieldresults.However,thetreatmentin ofCPBasavectorofpotatovirus monitorsarelessaccessible,andwhichapplicationswerebasedon disease(esp,PotatoVirusY).This existing potato yield maps generat-direct measurement of NNI omitted informationwillassistinassessing edfromyieldmonitorsshowlowthe fourth and final application of the need for and developing appro- accuracyandinconsistency,easily20 lbsac-1 N as UAN, and this treat- priate foliar management programs causingimproperinterpretationof22 POTATO GROWER MARCH 2021'