Agrobase Canada
Smooth sowthistle (common sowthistle, milk thistle, annual sow-thistle)
Sonchus oleraceus

Annual, lactiferous, seed-propagated weed with strong, cone-shaped taproot. S. oleraceus produces latex and is a preferred feed for birds, chicken and geese.
Flower heads light yellow to greenish yellow (Sonchus arvensis: intensive yellow). Leaves and stems contain milky sap. Soft, floppy, shiny, greasy, bluegreen leaves.
Young Plant: Round, often flatly sinuate in front, light green, entire, petiolate.
Stems: Erect, thick, ramified, up to 80 cm-100 cm (2.62 - 3.28 ft) high.
Leaves: First leaves nearly circular, with fine teeth; following leaves runcinate-pinnatifid or undivided, soft, blue-green, enclosing the stalk sagittately, prickly dentate.

Effective on
2,4-D Amine 600
Efficiency: ★★★
2,4- D Ester 700
Efficiency: ★★★
Accurate
Efficiency: ★★★
Agri Star 2,4-D Ester 700
Efficiency: ★★★
Albaugh 2,4-D Amine 600
Efficiency: ★★★
Albaugh 2,4-D Amine 600 Liquid
Efficiency: ★★★
Alion
Efficiency: ★★★
Blackhawk
Efficiency: ★★★
Carnival 540
Efficiency: ★★★
Cheminova Glyphosate
Efficiency: ★★★
Cheminova Glyphosate II
Efficiency: ★★★
Clearout 41 Plus
Efficiency: ★★★
Converge Flexx
Efficiency: ★★★
Converge Pro Suspension
Efficiency: ★★★
Credit 360
Efficiency: ★★★
Credit 45
Efficiency: ★★★
Credit Plus
Efficiency: ★★★
Credit Xtreme
Efficiency: ★★★
Curtail M
Efficiency: ★★★
Cycle
Efficiency: ★★★
Depose
Efficiency: ★★★
Devrinol 10-G
Efficiency: ★★★
Devrinol 2-G Ready-to-use
Efficiency: ★★★
Durango
Efficiency: ★★★
Estaprop XT
Efficiency: ★★★
Flaxmax
Efficiency: ★★★
Flexstar GT
Efficiency: ★★★
Frontline 2,4-D XC A
Efficiency: ★★★
Frontline 2,4-D XC B
Efficiency: ★★★
GF-2018
Efficiency: ★★★
GF-772
Efficiency: ★★★
Glyfos Bio
Efficiency: ★★★
Glyfos Bio 450
Efficiency: ★★★
Glyfos Soluble Concentrate
Efficiency: ★★★
Glyfos Soluble Concentrate II
Efficiency: ★★★
Glyphos AU Soluble Concentrate
Efficiency: ★★★
Glyphosate 480
Efficiency: ★★★
Glyphosate-Trimesium 480
Efficiency: ★★★
Indaziflam 200 SC
Efficiency: ★★★
Indaziflam 500 SC
Efficiency: ★★★
Infinity
Efficiency: ★★★
Lexone DF Toss-N-Go
Efficiency: ★★★
Maverick II
Efficiency: ★★★
MON 76429 Liquid
Efficiency: ★★★
MON 76431 Liquid
Efficiency: ★★★
MON 76669 Liquid
Efficiency: ★★★
MON 78027
Efficiency: ★★★
MON 79791 Liquid
Efficiency: ★★★
MON 79828 Liquid
Efficiency: ★★★
Navius
Efficiency: ★★★
Navius VM
Efficiency: ★★★
NuGlo
Efficiency: ★★★
Powermax Liquid
Efficiency: ★★★
PP-Q52-105
Efficiency: ★★★
PSABRY
Efficiency: ★★★
R/T 540 Liquid
Efficiency: ★★★
Renegade HC Liquid
Efficiency: ★★★
Restore B
Efficiency: ★★★
Restore II
Efficiency: ★★★
Roundup Transorb HC Liquid
Efficiency: ★★★
Roundup Transorb Liquid
Efficiency: ★★★
Roundup Transorb Max Liquid
Efficiency: ★★★
Roundup Ultra 2 Liquid
Efficiency: ★★★
Roundup Ultra Liquid
Efficiency: ★★★
Roundup WeatherMAX With Transorb 2 Technology Liquid
Efficiency: ★★★
Roundup Xtend with VaporGrip Technology
Efficiency: ★★★
RRRPSABRY
Efficiency: ★★★
SC547
Efficiency: ★★★
Sencor 480 F
Efficiency: ★★★
StartUp
Efficiency: ★★★
Target DS
Efficiency: ★★★
Touchdown IQ
Efficiency: ★★★
Triton C 75 DF
Efficiency: ★★★
Truvist
Efficiency: ★★★
Velocity 2
Efficiency: ★★★
Velocity m3 All-In-One
Efficiency: ★★★
VisionMAX
Efficiency: ★★★
2,4-D Amine 500
Efficiency: ★★
2,4-D BEE-4
Efficiency: ★★
2,4-D LV-600
Efficiency: ★★
2,4-D LV-700
Efficiency: ★★
Accurate WSB
Efficiency: ★★
Baseline A
Efficiency: ★★
Benchmark A
Efficiency: ★★
Boost M
Efficiency: ★★
Devrinol 2-XT
Efficiency: ★★
Devrinol 50-DF
Efficiency: ★★
Enlist Duo
Efficiency: ★★
Florasulam l
Efficiency: ★★
GF-2654 TC
Efficiency: ★★
GF-2654 TSOY
Efficiency: ★★
GF-2726 TSOY
Efficiency: ★★
GoldWing
Efficiency: ★★
Guardsman Glyphosate
Efficiency: ★★
MCPA Amine
Efficiency: ★★
MCPA Amine 600
Efficiency: ★★
MCPA DMA 500
Efficiency: ★★
MCPA Ester 600
Efficiency: ★★
MCPA-K
Efficiency: ★★
MCPA Sodium 300
Efficiency: ★★
Prep II
Efficiency: ★★
Pyro
Efficiency: ★★
ReadySet SC
Efficiency: ★★
Rexade B
Efficiency: ★★
Spitfire 50 SC
Efficiency: ★★
Tropotox Plus 400
Efficiency: ★★
Accord Dry Flowable
Efficiency: ★
Agri Star MCPA DMA 500
Efficiency: ★
Albaugh MCPA Ester 600 Liquid
Efficiency: ★
Ally 20 SG
Efficiency: ★
Ally Herbicide Dry Flowable 60
Efficiency: ★
Ally Herbicide Toss-N-Go
Efficiency: ★
Arsenal
Efficiency: ★
Broadband
Efficiency: ★
Facet L
Efficiency: ★
Florasulam II
Efficiency: ★
Florasulam WDG
Efficiency: ★
Formula 40 C
Efficiency: ★
Frontline A
Efficiency: ★
Frontline B
Efficiency: ★
Frontline I
Efficiency: ★
GF-1352
Efficiency: ★
Metsulfuron Methyl EUP
Efficiency: ★
Metsulfuron Methyl EUP Toss-N-Go
Efficiency: ★
Plus M Ester 600
Efficiency: ★
PrePass 250 WG
Efficiency: ★
PrePass A
Efficiency: ★
PrePass B
Efficiency: ★
Retain B
Efficiency: ★
Arsenal Powerline
Efficiency: not_available
Attain A
Efficiency: not_available
Attain B
Efficiency: not_available
Attain XC A
Efficiency: not_available
Chaperone
Efficiency: not_available
Classic 25 DF
Efficiency: not_available
Classic Grande
Efficiency: not_available
Clearview
Efficiency: not_available
Clopyralid
Efficiency: not_available
Conquest A Herbicide Tank Mix
Efficiency: not_available
Conquest B
Efficiency: not_available
Crush'R 480
Efficiency: not_available
Crush'R Plus
Efficiency: not_available
Define DF
Efficiency: not_available
Deploy 75 DF
Efficiency: not_available
DPX-MAT 28
Efficiency: not_available
DPX-R9674 50 SG
Efficiency: not_available
Express Toss-N-Go Dry Flowable 75
Efficiency: not_available
Flaxmax Herbicide Component of Tank Mix
Efficiency: not_available
Flufenacet 60 Water Dispersible Granular
Efficiency: not_available
Fluroxypyr 180
Efficiency: not_available
Fluroxypyr EC
Efficiency: not_available
Fluroxypyr WDG
Efficiency: not_available
FX
Efficiency: not_available
GF-2685
Efficiency: not_available
GF-871
Efficiency: not_available
GF2050
Efficiency: not_available
GlyKamba
Efficiency: not_available
GP
Efficiency: not_available
Impede
Efficiency: not_available
Maverick III
Efficiency: not_available
Milestone
Efficiency: not_available
Nuance
Efficiency: not_available
Nuance WSB
Efficiency: not_available
Nufarm Fluroxypyr
Efficiency: not_available
Nufarm Glyphosate 360
Efficiency: not_available
Nufarm Spike 75
Efficiency: not_available
Perimeter
Efficiency: not_available
Perimeter II
Efficiency: not_available
Polaris
Efficiency: not_available
PP-3317
Efficiency: not_available
PrePass 480
Efficiency: not_available
Prestige A
Efficiency: not_available
Prestige B
Efficiency: not_available
Reclaim II A
Efficiency: not_available
Reclaim II B
Efficiency: not_available
Refine Extra 75 DF
Efficiency: not_available
Refine SG
Efficiency: not_available
Refine SG Toss-N-Go
Efficiency: not_available
Restore A
Efficiency: not_available
Salute B
Efficiency: not_available
Sencor 500 Flowable
Efficiency: not_available
Sencor Solupak
Efficiency: not_available
Sentrallas
Efficiency: not_available
Sightline A
Efficiency: not_available
Signal F
Efficiency: not_available
Traxos Two Broadleaf Component
Efficiency: not_available
Tribenuron Methyl EUP DF 75
Efficiency: not_available
Vantage
Efficiency: not_available
Vantage MAX
Efficiency: not_available
Vantage Plus
Efficiency: not_available
Vantage Plus MAX
Efficiency: not_available
Velocity A (A Component of Velocity M3 Herbicide Tank Mix)
Efficiency: not_available
Velocity B (A Component of Velocity M3 Herbicide Tank Mix)
Efficiency: not_available
Vios G3
Efficiency: not_available
VP480
Efficiency: not_available