Agrobase Canada
Prickly lettuce
Lactuca serriola (Lactuca scariola)

It has a hairless reddish stem, containing a milky latex, growing from 30 to 200 cm.
The leaves are oblong lanceolate, often pinnated (especially for the lower leaves), waxy grey green. Fine spines are along the edges. The undersides have whitish veins.
The flower heads are 11 to 13mm wide, are pale yellow, often tinged purple. The bracts are also often tinged purple. It flowers from July until September.
The achenes are grey, bristly tipped. The pappus is white with equal length hairs

Effective on
2,4-D Amine 500
Efficiency: ★★★
2,4-D Amine 600
Efficiency: ★★★
2,4-D BEE-4
Efficiency: ★★★
2,4-D Ester 700
Efficiency: ★★★
2,4- D Ester 700
Efficiency: ★★★
2,4-D LV-600
Efficiency: ★★★
2,4-D LV-700
Efficiency: ★★★
Accurate
Efficiency: ★★★
Adrenalin SC
Efficiency: ★★★
Agri Star 2,4-D Ester 700
Efficiency: ★★★
Agri Star MCPA DMA 500
Efficiency: ★★★
Aim EC
Efficiency: ★★★
Albaugh 2,4-D Amine 600
Efficiency: ★★★
Albaugh 2,4-D Amine 600 Liquid
Efficiency: ★★★
Albaugh MCPA Ester 600 Liquid
Efficiency: ★★★
Attain XC B
Efficiency: ★★★
Blackhawk
Efficiency: ★★★
Carnival 540
Efficiency: ★★★
Cheminova Glyphosate
Efficiency: ★★★
Cheminova Glyphosate II
Efficiency: ★★★
Clearout 41 Plus
Efficiency: ★★★
Clearview
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: ★★★
Enlist Duo
Efficiency: ★★★
Flexstar GT
Efficiency: ★★★
Formula 40 C
Efficiency: ★★★
Frontline 2,4-D XC A
Efficiency: ★★★
Frontline 2,4-D XC B
Efficiency: ★★★
Frontline A
Efficiency: ★★★
Frontline B
Efficiency: ★★★
Frontline I
Efficiency: ★★★
Frontline XL
Efficiency: ★★★
GF-2018
Efficiency: ★★★
GF-772
Efficiency: ★★★
GF-871
Efficiency: ★★★
GF2050
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: ★★★
Grazon
Efficiency: ★★★
Grazon XC
Efficiency: ★★★
Lexone DF Toss-N-Go
Efficiency: ★★★
Maverick II
Efficiency: ★★★
MCPA 2 EH Ester 600
Efficiency: ★★★
MCPA Amine
Efficiency: ★★★
MCPA Amine 600
Efficiency: ★★★
MCPA Ester 500 LV
Efficiency: ★★★
MCPA Ester 600
Efficiency: ★★★
MCPA-K
Efficiency: ★★★
MCPA Sodium 300
Efficiency: ★★★
Milestone
Efficiency: ★★★
MON 76429 Liquid
Efficiency: ★★★
MON 76431 Liquid
Efficiency: ★★★
MON 76669 Liquid
Efficiency: ★★★
MON 78027
Efficiency: ★★★
MON 79791 Liquid
Efficiency: ★★★
MON 79828 Liquid
Efficiency: ★★★
NuGlo
Efficiency: ★★★
OcTTain XL
Efficiency: ★★★
Plus M Ester 600
Efficiency: ★★★
Powermax Liquid
Efficiency: ★★★
PP-3317
Efficiency: ★★★
R/T 540 Liquid
Efficiency: ★★★
Renegade HC Liquid
Efficiency: ★★★
Restore B
Efficiency: ★★★
Restore II
Efficiency: ★★★
Retain B
Efficiency: ★★★
Rexade B
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: ★★★
Scuttle
Efficiency: ★★★
Sightline A
Efficiency: ★★★
StartUp
Efficiency: ★★★
Stellar B
Efficiency: ★★★
Stellar XL
Efficiency: ★★★
Touchdown 480 Liquid
Efficiency: ★★★
Touchdown IQ
Efficiency: ★★★
Touchdown Total
Efficiency: ★★★
Traxion
Efficiency: ★★★
Traxos Two Broadleaf Component
Efficiency: ★★★
Trophy 600 A
Efficiency: ★★★
Trophy 600 B
Efficiency: ★★★
Trophy A
Efficiency: ★★★
Trophy B
Efficiency: ★★★
Truvist
Efficiency: ★★★
VisionMAX
Efficiency: ★★★
Devrinol 2-XT
Efficiency: ★★
Devrinol 50-DF
Efficiency: ★★
Guardsman Glyphosate
Efficiency: ★★
Indaziflam 200 SC
Efficiency: ★★
Indaziflam 500 SC
Efficiency: ★★
Alion
Efficiency: ★
Buctril M
Efficiency: ★
Accurate WSB
Efficiency: not_available
Ally 20 SG
Efficiency: not_available
Ally Herbicide Dry Flowable 60
Efficiency: not_available
Attain A
Efficiency: not_available
Attain B
Efficiency: not_available
Attain XC A
Efficiency: not_available
Boost M
Efficiency: not_available
Broadband
Efficiency: not_available
Chaperone
Efficiency: not_available
Classic 25 DF
Efficiency: not_available
Classic Grande
Efficiency: not_available
Credit
Efficiency: not_available
Crush'R 480
Efficiency: not_available
Crush'R 540
Efficiency: not_available
Crush'R Plus
Efficiency: not_available
Curtail F
Efficiency: not_available
DB-858
Efficiency: not_available
Deploy 75 DF
Efficiency: not_available
DPX-R9674 50 SG
Efficiency: not_available
Dycleer Agricultural
Efficiency: not_available
Eragon
Efficiency: not_available
Eragon LQ
Efficiency: not_available
Estaprop XT
Efficiency: not_available
Express DF 75
Efficiency: not_available
Express SG EUP
Efficiency: not_available
Express Toss-N-Go Dry Flowable 75
Efficiency: not_available
Fluroxypyr 180
Efficiency: not_available
Fluroxypyr EC
Efficiency: not_available
Fluroxypyr WDG
Efficiency: not_available
FX
Efficiency: not_available
Glean
Efficiency: not_available
GlyKamba
Efficiency: not_available
Glyphogan Plus
Efficiency: not_available
Impede
Efficiency: not_available
Inferno WDG
Efficiency: not_available
Integrity
Efficiency: not_available
Maverick III
Efficiency: not_available
Metsulfuron Methyl EUP Toss-N-Go
Efficiency: not_available
Nimble
Efficiency: not_available
Nimble WSB
Efficiency: not_available
Nuance
Efficiency: not_available
Nuance WSB
Efficiency: not_available
Nufarm Boost
Efficiency: not_available
Nufarm Fluroxypyr
Efficiency: not_available
Nufarm Glyphosate 360
Efficiency: not_available
Nufarm Spike 75
Efficiency: not_available
Nufarm Trophy 600 A
Efficiency: not_available
Nufarm Trophy 600 B
Efficiency: not_available
Optill
Efficiency: not_available
Perimeter
Efficiency: not_available
Perimeter II
Efficiency: not_available
Polaris
Efficiency: not_available
PP-31155
Efficiency: not_available
PrePass 480
Efficiency: not_available
Prestige XC A
Efficiency: not_available
Prestige XC B
Efficiency: not_available
Prestige XL
Efficiency: not_available
Pulsar
Efficiency: not_available
Reclaim II A
Efficiency: not_available
Reclaim II B
Efficiency: not_available
Refine Extra 75 DF
Efficiency: not_available
Refine Extra 75 Toss-N-Go
Efficiency: not_available
Refine SG
Efficiency: not_available
Refine SG Toss-N-Go
Efficiency: not_available
Restore A
Efficiency: not_available
Sencor 480 F
Efficiency: not_available
Sencor 500 Flowable
Efficiency: not_available
Sencor 75 DF
Efficiency: not_available
Sencor Solupak
Efficiency: not_available
Sentrallas
Efficiency: not_available
Signal F
Efficiency: not_available
Spitfire 50 SC
Efficiency: not_available
Tribenuron Methyl EUP DF 75
Efficiency: not_available
Triton Broadleaf
Efficiency: not_available
Vantage
Efficiency: not_available
Vantage MAX
Efficiency: not_available
Vantage Plus
Efficiency: not_available
Vantage Plus MAX
Efficiency: not_available
VP480
Efficiency: not_available
XRM-5171
Efficiency: not_available