Giant Ragweed

Overview

Soybean, a linchpin of the global agricultural industry, grapples with a myriad of diseases and pests. Among these, the giant ragweed, or Ambrosia trifida, emerges as a formidable adversary.

Research indicates it can lead to yield losses of up to 52% in heavily infested fields.

Giant ragweed impacts different parts of the soybean plant. Its expansive leaves can overshadow soybean plants, hindering their ability to photosynthesize effectively. This can stunt growth and impede pod and seed development. Moreover, the weed's robust root system can outcompete soybean roots for water and nutrients, further affecting plant health and productivity.

The influence of giant ragweed on soybean extends beyond resource competition. The weed can disrupt soybean physiology by releasing chemicals into the soil that inhibit soybean growth, a process known as allelopathy.


How to Identify Giant Ragweed

The giant ragweed, living up to its name, is a towering plant, often stretching up to 12 feet. Its defining features include large, rough, three- to five-lobed leaves, a thick, hairy stem, and small, green flowers that cluster at the plant's apex.

Geographic Impact of Giant Ragweed

Giant ragweed is indigenous to North America but has expanded its reach to other continents, including Europe and Asia. In the United States, it is predominantly found in the Midwest, flourishing in the fertile soils of agricultural fields.

Timing of Giant Ragweed Emergence

Giant ragweed typically sprouts earlier than other weeds, often making its appearance in early spring. This early emergence, coupled with its swift growth rate, enables it to outcompete other plants for resources.

How to Manage Giant Ragweed in Soybeans

Herbicide resistance is a problem when managing giant ragweed in soybeans. Growers should assume resistance to glyphosate for management purposes. Some giant ragweed populations may be resistant to ALS-herbicides as well. Best practice is to spray 2,4-D choline post-emergence in tolerant soybeans for effective giant ragweed control.

With new rules, growers can't spray dicamba in-season for control. Conventional soybean post-spray management options are limited to glyphosate plus effective post-emergence broadleaf herbicides.

Pre-emergence

Herbicides containing chlorimuron (Authority Maxx) or cloransulam (Willowood Sulfen Cloran) applied pre-emergence at full rates are the most effective for limiting emergence of ALS-sensitive giant ragweed populations.

Post-emergence

Burndown

A2,4-D ester (2,4-D LV6 Value Pick) or dicamba (Dicamba DMA 4 Value Pick) in combination with glyphosate (Willowood Glypho 5) or paraquat (Willowood Paraquat 3SL). Note seven days needed between 2,4-D ester application and soybean planting.

These rates are general recommendations. It's essential to read and follow the specific instructions on the product labels for accurate application rates and guidelines.

Disclaimer

2014 - 2024 Farmer's Business Network, Inc. All rights Reserved. The sprout logo, “Farmers Business Network”, “FBN”, “FBN Direct” are trademarks or registered trademarks of Farmer's Business Network, Inc. This content was written by Norm℠, reviewed and edited by Mikaela Tierney.

This content was generated with the assistance of Norm℠, FBN’s artificial intelligence (AI) Ag Advisor, based on a dataset of information containing general industry best practices and research. The AI model did not use specific external sources to generate this content. Our process involves using AI to aid human subject matter experts with the initial drafting and/or refinement of content.

The information and content provided is believed to be reliable, but its accuracy is not guaranteed. The content is provided for informational purposes only. It is not intended to be a substitute for specific agronomic, business, or professional advice, and should not be relied upon as such. Neither Farmer's Business Network Inc. nor any of its affiliates makes any representations or warranties, express or implied, as to the accuracy or completeness of the statements or any information contained in the material and any liability therefore is expressly disclaimed. If you have any questions or feedback about the content, please feel free to contact us or visit our FAQ (https://www.fbn.com/community/blog/norm-faq).

Every product that labels GIANT RAGWEED as a weed, pest, or disease the product can be applied against is shown below. Click any product for label and more information.
2,4-D Amine 42,4-D Amine 42,4-D Amine 4 Herbicide2,4-D LV 42,4-D LV 4 (Albaugh)2,4-D LV 62,4-D LV 6 (Albaugh)2,4-DB 1752,4-DB 2002,4-DB 2002,4-DB 2002,4-DB DMA 1752,4-DB DMA 200638 HerbicideAbundit® EdgeAbundit® EdgeAbundit™ Extra (Exclusively Distributed by DuPont)Accolade™ HerbicideAccord® Concentrate HerbicideAccord® XRT HerbicideAccord® XRT II HerbicideAcellus™ ATZAcifin™ 2LAcifluorfen 2Acuron®Acuron® FlexiAcuron® GTAffinity® TankMixAffinity® TankMix Herbicide (with TotalSol®)Afforia™Agri Star Dicamba HDAlecto™ 41SAlite™ 27 HerbicideAlligare 2,4-D AmineAlligare 2,4-D LV6Alligare Dicamba 4Alligare Flagstaff™ HerbicideAlligare Imazapyr 2 SLAlligare Imazapyr 4 SLAlligare Rotary 2 SLAmber® Custom-Pak™Amine 4 2,4-DAmine 4 2,4-D HerbicideAmine 400 2,4-D Weed KillerAmvac Scepter® 70 DG herbicideAndros® 1.88Anthem® ATZ HerbicideAqua Star®Aquamaster®AquaNeat® Aquatic HerbicideAquesta™ FRArgosArmezon® herbicideArmezon® PRO herbicideArrest PlusArsenal® herbicideArsenal® herbicide Applicators ConcentrateArsenal® PowerLine™ herbicideAtticus Cavallo™ 4 SCAudit® 4:1Authority® First DFAuthority® MaxxAuthority® XL HerbicideAutonomy™ HerbicideAvalanche® UltraAvalanche® UltraAxill Solutions Glufosinate 280SLBalance® FlexxBalance® ProBallast™Banvel 480 HerbicideBanvel® HerbicideBarrage® HFBasagran®Basagran® 5LBasagran® HerbicideBasagran® HerbicideBasagran® HerbicideBasagran® HerbicideBasagran® T&O herbicideBase Camp® Amine 4Base Camp® LV 6BashAzon HerbicideBasis® HerbicideBatalium® AmpedBatalium® IIBatalium™Battle Star®Beacon® HerbicideBellum®Beyond® herbicideBeyond® Xtra herbicideBicep II MAGNUM®Bicep II MAGNUM® FCBicep Lite II MAGNUM®Biscayne™Bison®Bison® HerbicideBiteBL4BOABoomer™ HerbicideBrawl II ATZ™Breakfree® ATZBreakfree® ATZ LiteBreakfree® NXT ATZBroadloom® HerbicideBroadrange® 55 HerbicideBroadStar® HerbicideBroadworks™Broclean®Broclean® HerbicideBromac®Bromac® AdvancedBronate® Advanced™Brox® 2ECBrox®-MBrox®-M UltraBrozine®Buccaneer® (55467-10)Buccaneer® 5Buccaneer® 5 ExtraBuccaneer® Plus (55467-9)Butyrac® 200CaballeroCadence® ATZ NXTCadence® LA NXTCadence™ ATZCadence™ Lite ATZ HerbicideCalibra™Callisto®Callisto® GTCallisto® XtraCamo™Canopy® BlendCanopy® EX HerbicideCanopy® HerbicideCapreno®Celebrity® PlusCelsius® WGCelsius® XtraCharger MAX® ATZCharger MAX® ATZ LiteChateau® EZChateau® Herbicide SWCheetah® HerbicideCheetah® ProCheetah™ Max HerbicideChiptox® MCPAChlorimuron 25 WDGCinch® ATZCinch® ATZ LiteCinco™Clarifier®Clarifier®Clarity® herbicideClash® Selective HerbicideClassic® HerbicideClassic® HerbicideClean Amine®Clean Slate® (Nufarm)CleanWave® HerbicideClearGraze™Cloak®Cloak® EXCobra® HerbicideColt® ASColt®+Salvo® HerbicideColt®+Sword® HerbicideComet® Selective HerbicideCommando M™Commando™Commit ATZ Lite HerbicideCommit® ATZ HerbicideComply™ HerbicideConfidence®Confidence® XtraConfidence® Xtra 5.6LCornbelt® 4Lb. AmineCornbelt® 4Lb. Lo Vol EsterCornbelt® 6Lb. Lo Vol EsterCornbelt® SalvanCornerstone K HerbicideCornerstone®Cornerstone® 5 PlusCornerstone® Plus (1381-192)Cornerstone® Plus (524-454-1381)Corsican HerbicideCorvetteCorvus®Coyote™Credit® 41Credit® 41 ExtraCredit® 5.4 ExtraCredit® XtremeCurio® HerbicideCurtail® HerbicideCurtail® M HerbicideD-638Daikon™Dally®Dawn® HerbicideDe-Amine™ 4De-Ester™LV4Deadbolt®DefiniteDefy® Amine 4Defy® LV-4Defy® LV-6Degree Xtra® HerbicideDegree Xtra® HerbicideDegree® HerbicideDepth Charge™Derecho™Derigo® HerbicideDerive 75 DFDerive® 4LDetail® powered by Kixor® herbicideDetonate® HerbicideDetonate® Herbicide (old version)Diablo® Herbicide (Nufarm)Dicamba DGADicamba DMA SaltDicamba DMA Salt 5Dicamba HD 5Dicamba Max 4Dicamba XPDiCash DGA-4DiFlexx® DUODiFlexx™ HerbicideDimetric® DF 75%Dimetric® EXTDimetric® LiquidDisha DMADistinct® herbicideDMA® 4 IVM HerbicideDog Fight™Doleac™ DMADolerity™ DGADouble HeaderDrexel Dicamba HerbicideDrexel Mes-O-Sate™Dryphosate 75SGDuramax® HerbicideDurango® DMA® 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Power Plus®Freelexx®Frequency® herbicideFrontRunner™Fugitive®Full Deck™FulTime® HerbicideFulTime® NXTG-Max Lite™ herbicideGambit® HerbicideGCS 2,4-D LV 6 EsterGCS Acetochlor 7ECGCS Clopy 360SLGCS Flumet 80WDGGCS MesoXtra HerbicideGCS Quinclo 4GF-3335Glory®Gly Star® 5 ExtraGly Star® GoldGly Star® K-PlusGly Star® OriginalGly Star® PlusGly Star® Pro Grass and Weed KillerGlyfine™ PlusGlyfos® Aquatic HerbicideGlyfos® X-TRA HerbicideGlyphogan® HerbicideGlyphogan® Plus HerbicideGlyphosate 4 PlusGlyphosate 5.4Graslan® LGravitas®Grazon® P+D Specialty HerbicideGrazonPD3™Guardsman Max® herbicideGunSlinger®Gunslinger® P+DHABITAT® herbicideHalex® GTHalomax™ 75HardBall®Harness® HerbicideHarness® Herbicide (Monsanto)Harness® MAX HerbicideHarness® MAX HerbicideHarness® XtraHarness® Xtra (Monsanto)Harness® Xtra 5.6 LHarness® Xtra 5.6LHat Trick® Three Way HerbicideHavoc LV-SixHavoc™ LV FourHelmet MaxxHelosate® 75 SGHelosate® Plus AdvancedHerbivore® HerbicideHi-Dep® Broadleaf HerbicideHighNoon™ 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DMaestro® MAMainline™Makaze Yield Pro®Makaze® HerbicideMalibu™Mamba™Marksman® herbicideMarvel HerbicideMatador®Matador®-SMaverick™ Corn HerbicideMCPA AmineMe-Try-Buzin™ 4LMe-Try-Buzin™ 75DFMedal® II ATMedal® II ATZMeso StarMeso Star PlusMesoCore®Mesotrione 4SCMesoTryOne™ 4LMesoXtra HerbicideMetalliS™ PFXMethod® 240SLMetolachlor + MesoATZMetribuzin 75Metribuzin 75DFMetricor™ 4FMetricor™ DFMetriflex 4SCMetrixxMetrixx 75DFMetrixx PlusMetrixx SCMicro-Tech®Mirage® (524-445-34704)Mojave 70 EGMongoose™ HerbicideMotif™ HerbicideMoxy® 2ENorthstar® HerbicideNoventa™ HerbicideNufarm Imazapic 2SLNufarm Imazapic 2SL IVM HerbicideNufarm Imazuron™ HerbicideNufarm Leopard™ HerbicideNufarm Polaris® AC Complete HerbicideNufarm Polaris® AC HerbicideNufarm Polaris® HerbicideNufarm Polaris® SPNufarm Prosedge Selective HerbicideNufarm Prosedge Selective Herbicide²Octivio™Octivio™ PulseOmni® Brand Metribuzin 75 DFOpportunityOptero™OpTill® powered by Kixor® herbicideOpTill® PRO Herbicide (Liquid)OpTill® PRO powered by Kixor® herbicideOptogen™Orchard Clean®Orchard Star®Oryzalin 4 A.S. HerbicideOust® ExtraOust® ExtraOutflank™OverTime™ ATZ HerbicideOverTime™ ATZ Lite HerbicideOverTime™ ATZ Lite NXTOverTime™ ATZ NXTPalace™ Selective HerbicidePanoramic® 2SLPanther® D HerbicidePanther® HerbicidePanther® MTZ HerbicidePanther® Pro HerbicidePanther® SC HerbicideParallel® PlusParamount® herbicidePasturAll® HL Specialty HerbicidePasturAll® Specialty HerbicidePastureGard® HLPastureGard® Specialty HerbicidePayback ATZPayload® HerbicidePayload® SCPeak®Pemex™PerfectMatch™ HerbicidePermit Plus®Permit® HerbicidePhenomenon™ DuoPhoenix™ HerbicidePiper™ HerbicidePixxaro® ECPlateau® herbicidePraxisPraxis PlusPRE-Tector™ Plus ECPrefix® HerbicidePrequel®Priority MAPriority MesoPriority® GTPrizeProfine™ 75Promenade™Promote™PunchPursuit® herbicidePylex™ herbicidePython® HerbicidePython® WDG HerbicideQuake™ HerbicideQuartz™ 4LQuartz™ HerbicideQuinStar® 4LRadar™ AM 4Rancor™ 4 FRancor™ 75 DFRanger PRO® HerbicideRanger PRO® Herbicide (Monsanto)Rapport® Tank Mix HerbicideRaptor® herbicideRascal® PlusRave® HerbicideRavine™Razor Burn®Razor®Razor® ProRazor® Xtreme HerbicideRealm® QRealm® QReciteReckon™ 280SLRedEagle Flumioxazin 51% WDG Specialty + Field (California)Refer® 280 SL HerbicideReflex®Rely® 280Rely® 280 HerbicideReptile WDGRequire® Q (mp)Resicore®Resicore® XLResist™ HerbicideResist™ HerbicideRestraint™ herbicideRevitonRevulin® QRevulin® QRezult® B herbicideRezult® G herbicideRezuvant™ herbicideRhonox® MCPARhythm® HerbicideRiceEdge® 60 DFRifle Plus®Rifle®Ringside®Rixa™Rodeo® HerbicideRoundup Custom®Roundup Custom® (Monsanto)Roundup PowerMAX®Roundup PowerMAX® 3 (Monsanto)Roundup PowerMAX® 3 HerbicideRoundup PowerMAX® HerbicideRoundup PowerMAX® IIRoundup PowerMAX® II (Monsanto)Roundup PRO® ConcentrateRoundup PRO® Concentrate (Monsanto)Roundup PRO® HerbicideRoundup PRO® Herbicide (Monsanto)Roundup PROMAX® HerbicideRoundup PROMAX® Herbicide (Monsanto)Roundup QuikPRO®Roundup QuikPRO™ (Monsanto)Roundup Ultra®Roundup WeatherMAX® (Monsanto)Roundup WeatherMAX® HerbicideRowel™ FX HerbicideRowel™ HerbicideRT 3® HerbicideRT 3® Herbicide (Monsanto)Rugged® HerbicideRumble®Saber®Sahara® DG herbicideSalvo®SalvusSandea®Savage® Dry SolubleScepter® 70 DG herbicideScepter® 70 DG herbicideScoparia HerbicideScorch™Scorch™ EXTScout™ HerbicideSedgeHammer® +SedgeHammer® Turf HerbicideSedona®Semera® 51.0% WDGSemera™ SCSentrallas® HerbicideSentrallas™Sequence®Shafen HerbicideShafen StarShar-Max Glyphosate 41% SLSharpSharpen® powered by Kixor® herbicideShieldex® 400SC HerbicideShowdown® HerbicideShredder® 2,4-D LV6Shredder® Amine 4Shredder® MCPAShredder™ 2,4-D LV4Shredder™ E-99Sinate® HerbicideSinister™Sinkerball®Slider® ATZSlider® ATZ LiteSmackdown™Solstice® HerbicideSolution Water Soluble®Solve™ 2,4-DSonic® HerbicideSonora™Sortie™ ATZSortie™ ATZ LiteSotrion™ HerbicideSpike® 80DF Specialty HerbicideSpirit® HerbicideSpur®Spyder® Extra Selective HerbicideStadia™Stalwart® 2WStalwart® 3WStalwart® Xtra HerbicideStalwart® Xtra LiteStanza™ HerbicideStarane® NXT HerbicideStarane® Ultra HerbicideStareDown™Stark™ UltraStatement™ HerbicideStatus® herbicideStaunch® IIStaunch™ HerbicideSterling Blue® HerbicideSterling® BlueSterling® Blue DGAStigmata™Stinger® HerbicideStinger® HLStoren™Storm® HerbicideStrive™Strongarm® HerbicideStrut®Sunphosate 41%Sunphosate 5 MAX (Wynca)Supremacy® HerbicideSureGuard® HerbicideSureGuard® SC HerbicideSureStart® HerbicideSureStart® IISurflan® A.S. AgriculturalSurflan® FlexSurmise®Surmise® 5Surmount® HerbicideSurveil® HerbicideSurveil™ Co-PackSurveil™ Co-Pack (Surveil™ V)Synchrony® XPTackle® HerbicideTalinor™Tavium® Plus VaporGrip® TechnologyTenkoz® Amine 4 2,4-D (71368-1-55467)Tenkoz® Lo-Vol 4 2,4-D Low VolatileTenkoz® Lo-Vol 4 Solventless HerbicideTenkoz® Lo-Vol 6 2,4-D Low Volatile HerbicideTerraVue™Testify™Thistrol® HerbicideThreesidual™ HerbicideThunder Master®Thunder®Tide Glufosinate 280 SLTigris™ Sulfen FirstTop Deck™ Aquatic HerbicideTop Gun® HerbicideTopeka®Torment®Total TNVTotal® 2.3Total® HerbicideTouchdown HiTech®Touchdown Total®Touchdown® CTTouchdown® HerbicideTraject™ 4SCTransline® Specialty HerbicideTravallas™Traxion®Treevix® powered by Kixor® herbicideTreflan® HFP HerbicideTremor® ATZ Lite NXTTremor® ATZ NXTTriangle® HerbicideTribal™Tribute® TotalTriCor® 4FTriCor® DFTrifluence™TripleFLEX® II HerbicideTripleFLEX® II HerbicideTripleFLEX™ HerbicideTrisidual™ HerbicideTriumph® XTRTrivence™TriVolt™Trizar™TrizMax™Trizmet™ IITrizmet™ LiteTrooper® P+DTrooper™ ExtraTrooper™ ProTrumpcard®Truslate®Truslate™ ProTurret®Tuscany®Tuscany® SC HerbicideUltra Blazer® (UPI)Undercover™Unison® Novel BroadleafUP-Front™UproarValor® EZ Herbicide¹Valor® EZ Herbicide²Valor® SX HerbicideValor® XLT Soybean HerbicideVamos®Vanquish® HerbicideVaristo® herbicideVarsity®Varsity® SCVendetta® HerbicideVenue®Verdict® powered by Kixor® herbicideVibrantVida® Herbicide/DesiccantVilify®Vios™ FX HerbicideVision™ HerbicideVista® XRT HerbicideVolley® ATZVolley® ATZ LiteVolley® ATZ LITE NXTVolley® ATZ NXTVoucher®Vulture™Warfox™Warrant® Ultra HerbicideWarrant® Ultra Herbicide (Monsanto)Weedar® 64WeeDestroy® AM-40 Amine SaltWeedone® 638Weedone® 650Weedone® LV4 ECWeedone® LV4 SolventlessWeedone® LV6 ECWeld® HerbicideWhetstone™ HerbicideWhiplash™Whiteout® 2,4-DWideARmatch™ HerbicideWideMatch® HerbicideWildCard® XTRAWillowood Chlorim 25WDGWillowood Cloran DFWillowood Fomesafen 1.88SLWillowood Glufosinate 280SLWillowood Glufosinate 280SL (OT)Willowood Glypho 6Willowood Imazethapyr 2SLWillowood Lactofen 2ECWillowood Mesotrione 4SCWillowood Metribuzin 75DFWillowood Metriosate GTWillowood Sulfen ChlorimWillowood Sulfen CloranWolverine® AdvancedWolverine® HerbicideXtendimax w/VaporGrip Technology (2020)XtendiMax® With VaporGrip® TechnologyYukon® HerbicideZaltus™ SCZemax™ Selective HerbicideZidua® PRO powered by Kixor® herbicideZone DefenseZone HerbicideZone Maxx Herbicide