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South Carolina Pest Management Handbook for Field Crops - 2017 PEANUTNEMATODECONTROL DanAnco,ExtensionPeanutSpecialist JohnD.Mueller,ExtensionPlantPathologist Fortunately,nematodeshavebeenarelativelyminorproblemonpeanutsinSouthCarolina.Peanutroot‐knot(race1) nematode is capable of causing severe losses, but economic injury has been very rare. Lesion nematode frequently causeshullinjuryongreenpeanutsandcancauseyieldreductionunderextremelyhighpopulations.Stingnematodeis rarely found in peanut fields in South Carolina, but when observed damage can be severe even at relatively low populations.Hullinjuryfromnematodeinfectioncanalsoleadtoincreasedfungalcolonizationanddiseaseofpods. NematodemanagementisnotrecommendedforpeanutsinSouthCarolinaunlessinjuryordamagetopeanuts hasbeendocumented.Croprotationandresistancearethemosteconomicalanddesiredmanagementstrategiesfor minimizing nematode problems. A nematode resistant variety (Georgia 14N, Tifguard, TifNV‐High O/L) is recommendedforfieldswithadocumentedhistoryofpeanutroot‐knotnematodeinjuryonpeanut.Afumigantlike TeloneII(field‐wide:6–9gal/A,in‐row:4.5–6gal/A)orVapamHL(6.61floz/100linearrowft)applied2weeksata depthof12”priortoplantingcanbeusedtosuppressnematodes.Alternatively,VelumTotal(18floz/A)canbeapplied in‐furroworthrough root‐zone chemigationto manage nematodesnearthetaproot. Propulse(13.6 fl oz/A)can be appliedatpegging(~45DAP)tomanagenematodesinthefruitingzonebutmustbewateringintobeeffective(0.10– 0.25 in/A water). AgLogic 15G (aldicarb) (7 lb/A at‐planting, with an optional pegging application at 10 lb/A) has recentlybeenapprovedforuseinnematodemanagement,thoughcurrentsupplymaybelimited. PeanutsareanexcellentrotationcroptosuppressReniform,SouthernRoot‐knotandColumbialancenematodesin cotton. FieldCropHostsforCommonNematodes Root‐knot Peanut Peanut Renifor Crop Southern race1 race2 Northern Lesion Lance Soybeancyst Sting Ring m Peanut ‐ + ‐ + + ‐ ‐ ± + ‐ Cotton + ‐ ‐ ‐ + + ‐ + + + Corn + + + + + + ‐ + ± ‐ Soybean + + + + + + + + ± + Tobacco + + + + + ‐ ‐ ‐ + + Small + + + + + + ‐ + + ‐ grain ‐(wheat) Grain + + + ? + ? ‐ + ‐ ‐ sorghum Tomato + + + + + ‐ ‐ + + ? +indicateshost;‐indicatesnon‐host;±indicateshostreactioncanvarybasedonpopulation.AdaptedbyJ.D. Muellerfrom:Powell,W.M.1990.PlantsusceptibilitytomajornematodesinGeorgia.Univ.ofGeorgiaExtension Bulletin904;andDickerson,O.J.,J.H.Blake,andS.A.Lewis.2000.NematodeguidelinesforSouthCarolina.Clemson Univ.ExtensionCircular703. 202