Canada Thistle


Canada thistle, also known as Cirsium arvense, is a perennial, herbaceous weed notorious for its detrimental effects on various crops, including corn.

Canada thistle poses a significant threat to corn crops due to its competitive nature and rapid spread. It competes with corn for vital resources such as water, nutrients, and light, leading to potential reductions in yield and quality.

Canada thistle impacts various parts of the corn plant:

• Roots: Canada thistle's extensive root system competes with corn for water and nutrients, potentially leading to stunted growth and reduced yield. • Stems and leaves: The thistle can overshadow corn plants, blocking sunlight and inhibiting photosynthesis. This can result in leaf yellowing and weakened stems. • Ears: Reduced photosynthesis and nutrient uptake can lead to underdeveloped ears with fewer kernels.

Canada thistle can also affect the overall physiology of the corn plant. The competition for resources can induce stress, making the corn plant more susceptible to diseases and pests. Additionally, the physical presence of the thistle can disrupt the pollination process, further reducing yield.

(Image Credit: Phil Westra, Colorado State University,

Canadian Thistle in Corn

How to Identify Canada Thistle

Canada thistle is a towering plant, standing 1–1.5 meters tall. Several markers can assist in identifying Canada thistle in your cornfield:

  1. Leaf structure: Canada thistle leaves are alternate, lance-shaped, and feature spiny, toothed edges. They exhibit a dark green hue on top and a lighter green underneath.

  2. Flower heads: The flower heads are small, typically purple or white, and cluster at the plant's apex.

  3. Stem: The stem of the Canada thistle is smooth, grooved, and branches at the top.

  4. Root system: The plant's root system is deep and extensive, reaching up to 3 meters into the soil. It poses a challenge for control once it establishes itself.

Geographic Impact of Canada Thistle

This invasive species, native to Europe and Asia, has migrated and now proliferates in many agricultural fields across Canada and the United States.

Canada thistle thrives under various conditions but is most frequently found in disturbed soils, such as those in agricultural fields, roadsides, and pastures. It is a resilient plant that can withstand a broad range of soil types and climates.

Timing of Canada Thistle

During the growing season, Canada thistle usually emerges in early spring and continues to grow throughout the summer. Flowering typically occurs from June to October. However, its extensive root system allows the plant to regenerate from root fragments at any point during the growing season.

It is crucial for farmers and agricultural professionals to identify this weed early in the growing season and implement appropriate control measures to minimize its impact on yield and crop quality.

How to Manage Canada Thistle in Corn


The best way to control Canada thistle is with effective, systemic herbicides. The best time to apply in corn is mid-to-late July, when the majority of weeds have emerged. Apply Stinger when thistles are 4 inches tall or taller and before bud stage. Apply glyphosate in the bud stage.


  • On glyphosate-resistant corn: glyphosate like Willowood Glypho 5

  • On all corn: clopyralid-based products such as Bite*

Always remember to read and follow the product label instructions for accurate application rates and guidelines specific to your location and crop conditions.


In Canada, several herbicides are available for control of Canada thistle in corn. Products that contain glyphosate, glufosinate, clopyralid, and bentazon can provide effective control. Some active ingredients like bromoxynil, dicamba, and MCPA can provide suppression of Canada thistle in corn. Specific herbicide recommendations are listed below.

Willowood Glypho 5 Tote


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Every product that labels CANADA THISTLE 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 6 (Albaugh)4-Speed® XT638 HerbicideAbundit® EdgeAbundit® EdgeAbundit™ Extra (Exclusively Distributed by DuPont)Accent® HerbicideAccent® QAccolade™ HerbicideAccord® Concentrate HerbicideAccord® XRT HerbicideAccord® XRT II HerbicideAccurate® ExtraAccurate® ExtraAccurate® HerbicideAcuron®Acuron® FlexiAcuron® GTAffinity® BroadSpecAffinity® BroadSpec Herbicide (with TotalSol™)Affinity® TankMixAffinity® TankMix Herbicide (with TotalSol®)Afforia™Agility® SG with TotalSol® Soluble GranulesAgri Star Dicamba HDAim® EC HerbicideAim® EW HerbicideAlecto™ 41SAlligare 2,4-D AmineAlligare 2,4-D LV6Alligare Dicamba 2,4-D DMAAlligare Dicamba 4Alligare Imazapyr 2 SLAlligare Imazapyr 4 SLAlligare MSM 60Alligare Triclopyr 4Alligare Triumph® 22KAlluvex™Ally® Extra SG Herbicide (with TotalSol®)Ally® Extra SG with TotalSolAlly® XPAlly® XPAmber® Custom-Pak™Amine 4 2,4-DAmine 4 2,4-D HerbicideAmine 400 2,4-D Weed KillerAmine 6Antik™ ECAqua Star®Aquamaster®AquaNeat® Aquatic HerbicideArgosArmezon® herbicideArmezon® PRO herbicideArsenal® herbicideArsenal® herbicide Applicators ConcentrateArsenal® PowerLine™ herbicideAtticus Cavallo™ 4 SCAudit® 1:1Audit® 4:1Audit® 75 WDGAudit® 9:1 HerbicideAutonomy™ HerbicideAutumn™ Super 51 WDG HerbicideAxill Solutions Glufosinate 280SLBallast™Banvel 480 HerbicideBanvel® HerbicideBarrage® HFBarrier® Ornamental Landscaping HerbicideBasagran®Basagran® 5LBasagran® HerbicideBasagran® HerbicideBasagran® HerbicideBasagran® HerbicideBasagran® T&O herbicideBase Camp® Amine 4Base Camp® LV 6Base Camp® MCP EsterBashAzon HerbicideBasis® BlendBattleship® IIIBeacon® HerbicideBestow™ HerbicideBeyond® herbicideBeyond® Xtra herbicideBiscayne™Bison®Bison® HerbicideBiteBOABoomer™ HerbicideBoulder 6.3Brash®Broadloom® HerbicideBroadrange® 55 HerbicideBroadStar® HerbicideBroclean®Broclean® HerbicideBromac®Bromac® AdvancedBronate® Advanced™Brox® 2ECBrox®-MBrox®-M UltraBrozine®Brush-Rhap®Buccaneer® (55467-10)Buccaneer® 5Buccaneer® 5 ExtraBuccaneer® Plus (55467-9)BurnMaster™ HerbicideCaballeroCalibra™Callisto® GTCallisto® XtraCandor® HerbicideCanopy® BlendCanopy® EX HerbicideCanopy® HerbicideCapreno®Capstone® Specialty HerbicideCasoron® 4GCasoron® 4GCelebrity® PlusCelsius® WGCelsius® WGCelsius® XtraCelsius® XtraChange Up™ Selective HerbicideChaparral™ Specialty HerbicideChaser® Turf HerbicideCheetah® HerbicideCheetah® ProCheetah™ Max HerbicideChiptox® MCPAChisum™ HerbicideChlorimuron 25 WDGCimarron® MaxCimarron® Max HerbicideCimarron® Max Part BCimarron® Max Part B HerbicideCimarron® PlusCimarron® PlusCimarron® X-traCinco™Ciramet™ HerbicideCivility™ ExtraClarifier®Clarifier®Clarity® herbicideClash® Selective HerbicideClassic® HerbicideClassic® HerbicideClean Amine®Clean Slate® (Nufarm)CleanWave® HerbicideCleat® 75 WG HerbicideCloak®Cloak® EXCobra® HerbicideColt® ASColt®+Salvo® HerbicideColt®+Sword® HerbicideComet® Selective HerbicideCommando M™Commando™Comply™ HerbicideConfront® Specialty HerbicideCool Power®Cornbelt® 4Lb. AmineCornbelt® 4Lb. Lo Vol EsterCornbelt® 6Lb. 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HerbicideStinger® HLStoren™Stout®Streamline®Strike Three Ultra® 2Stringent™Strive™Strut®Sunphosate 41%Sunphosate 5 MAX (Wynca)Supremacy® HerbicideSure Power® Selective HerbicideSureGuard® HerbicideSureGuard® SC HerbicideSureStart® HerbicideSureStart® IISurge® Broadleaf Herbicide for TurfSurmise®Surmise® 5Sword®Synchrony® XPT-Pac™ XPT-Square™ HerbicideTahoe® 3A HerbicideTahoe® 4E HerbicideTalinor™Taquet™Tarzec™Tavium® Plus VaporGrip® TechnologyTelar® XPTelar® XPTelone® II Soil FumigantTELONE™ II Soil FumigantTenacity®Tenkoz® 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 HerbicideTenkoz® MCPA Broadleaf Amine 4TerraVue™Testify™Tetris™ SGThistrol® HerbicideThreesidual™ HerbicideThrottle® XPThunder®Tide Glufosinate 280 SLTide Hexazinone 2SLTide Hexazinone 75 WDGTide MSM 60 DF HerbicideTopeka®Tordon® 22K Specialty HerbicideTordon® K Herbicide Specialty HerbicideTorment®Torocity™Total TNVTotal® 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638Weedone® 650Weedone® LV4 ECWeedone® LV4 SolventlessWeedone® LV6 ECWeld® HerbicideWestar®Whetstone™ HerbicideWhiplash™Whiteout® 2,4-DWideARmatch™ HerbicideWideMatch® HerbicideWildCard®WildCard® XTRAWillowood Chlorim 25WDGWillowood Cloran DFWillowood Glufosinate 280SLWillowood Glufosinate 280SL (OT)Willowood Glypho 6Willowood Imazethapyr 2SLWillowood Lactofen 2ECWillowood Mesotrione 4SCWillowood Metribuzin 75DFWillowood Metriosate GTWolverine® AdvancedWolverine® HerbicideXtendimax w/VaporGrip Technology (2020)XtendiMax® With VaporGrip® TechnologyYukon® HerbicideZemax™ Selective HerbicideZidua® PRO powered by Kixor® herbicide