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

Pesticides
2,4-D Amine 500
intensity: ★★★
2,4-D Amine 600
intensity: ★★★
2,4-D BEE-4
intensity: ★★★
2,4-D Ester 700
intensity: ★★★
2,4- D Ester 700
intensity: ★★★
2,4-D LV-600
intensity: ★★★
2,4-D LV-700
intensity: ★★★
Accurate
intensity: ★★★
Adrenalin SC
intensity: ★★★
Agri Star 2,4-D Ester 700
intensity: ★★★
Agri Star MCPA DMA 500
intensity: ★★★
Aim EC
intensity: ★★★
Albaugh 2,4-D Amine 600
intensity: ★★★
Albaugh 2,4-D Amine 600 Liquid
intensity: ★★★
Albaugh MCPA Ester 600 Liquid
intensity: ★★★
Attain XC B
intensity: ★★★
Blackhawk
intensity: ★★★
Carnival 540
intensity: ★★★
Cheminova Glyphosate
intensity: ★★★
Cheminova Glyphosate II
intensity: ★★★
Clearout 41 Plus
intensity: ★★★
Clearview
intensity: ★★★
Credit 360
intensity: ★★★
Credit 45
intensity: ★★★
Credit Plus
intensity: ★★★
Credit Xtreme
intensity: ★★★
Curtail M
intensity: ★★★
Cycle
intensity: ★★★
Depose
intensity: ★★★
Devrinol 10-G
intensity: ★★★
Devrinol 2-G Ready-to-use
intensity: ★★★
Durango
intensity: ★★★
Enlist Duo
intensity: ★★★
Flexstar GT
intensity: ★★★
Formula 40 C
intensity: ★★★
Frontline 2,4-D XC A
intensity: ★★★
Frontline 2,4-D XC B
intensity: ★★★
Frontline A
intensity: ★★★
Frontline B
intensity: ★★★
Frontline I
intensity: ★★★
Frontline XL
intensity: ★★★
GF-2018
intensity: ★★★
GF-772
intensity: ★★★
GF-871
intensity: ★★★
GF2050
intensity: ★★★
Glyfos Bio
intensity: ★★★
Glyfos Bio 450
intensity: ★★★
Glyfos Soluble Concentrate
intensity: ★★★
Glyfos Soluble Concentrate II
intensity: ★★★
Glyphos AU Soluble Concentrate
intensity: ★★★
Glyphosate 480
intensity: ★★★
Glyphosate-Trimesium 480
intensity: ★★★
Grazon
intensity: ★★★
Grazon XC
intensity: ★★★
Lexone DF Toss-N-Go
intensity: ★★★
Maverick II
intensity: ★★★
MCPA 2 EH Ester 600
intensity: ★★★
MCPA Amine
intensity: ★★★
MCPA Amine 600
intensity: ★★★
MCPA Ester 500 LV
intensity: ★★★
MCPA Ester 600
intensity: ★★★
MCPA-K
intensity: ★★★
MCPA Sodium 300
intensity: ★★★
Milestone
intensity: ★★★
MON 76429 Liquid
intensity: ★★★
MON 76431 Liquid
intensity: ★★★
MON 76669 Liquid
intensity: ★★★
MON 78027
intensity: ★★★
MON 79791 Liquid
intensity: ★★★
MON 79828 Liquid
intensity: ★★★
NuGlo
intensity: ★★★
OcTTain XL
intensity: ★★★
Plus M Ester 600
intensity: ★★★
Powermax Liquid
intensity: ★★★
PP-3317
intensity: ★★★
R/T 540 Liquid
intensity: ★★★
Renegade HC Liquid
intensity: ★★★
Restore B
intensity: ★★★
Restore II
intensity: ★★★
Retain B
intensity: ★★★
Rexade B
intensity: ★★★
Roundup Transorb HC Liquid
intensity: ★★★
Roundup Transorb Liquid
intensity: ★★★
Roundup Transorb Max Liquid
intensity: ★★★
Roundup Ultra 2 Liquid
intensity: ★★★
Roundup Ultra Liquid
intensity: ★★★
Roundup WeatherMAX With Transorb 2 Technology Liquid
intensity: ★★★
Roundup Xtend with VaporGrip Technology
intensity: ★★★
Scuttle
intensity: ★★★
Sightline A
intensity: ★★★
StartUp
intensity: ★★★
Stellar B
intensity: ★★★
Stellar XL
intensity: ★★★
Touchdown 480 Liquid
intensity: ★★★
Touchdown IQ
intensity: ★★★
Touchdown Total
intensity: ★★★
Traxion
intensity: ★★★
Traxos Two Broadleaf Component
intensity: ★★★
Trophy 600 A
intensity: ★★★
Trophy 600 B
intensity: ★★★
Trophy A
intensity: ★★★
Trophy B
intensity: ★★★
Truvist
intensity: ★★★
VisionMAX
intensity: ★★★
Devrinol 2-XT
intensity: ★★
Devrinol 50-DF
intensity: ★★
Guardsman Glyphosate
intensity: ★★
Indaziflam 200 SC
intensity: ★★
Indaziflam 500 SC
intensity: ★★
Alion
intensity: ★
Buctril M
intensity: ★
Accurate WSB
intensity: N/A
Ally 20 SG
intensity: N/A
Ally Herbicide Dry Flowable 60
intensity: N/A
Attain A
intensity: N/A
Attain B
intensity: N/A
Attain XC A
intensity: N/A
Boost M
intensity: N/A
Broadband
intensity: N/A
Chaperone
intensity: N/A
Classic 25 DF
intensity: N/A
Classic Grande
intensity: N/A
Credit
intensity: N/A
Crush'R 480
intensity: N/A
Crush'R 540
intensity: N/A
Crush'R Plus
intensity: N/A
Curtail F
intensity: N/A
DB-858
intensity: N/A
Deploy 75 DF
intensity: N/A
DPX-R9674 50 SG
intensity: N/A
Dycleer Agricultural
intensity: N/A
Eragon
intensity: N/A
Eragon LQ
intensity: N/A
Estaprop XT
intensity: N/A
Express DF 75
intensity: N/A
Express SG EUP
intensity: N/A
Express Toss-N-Go Dry Flowable 75
intensity: N/A
Fluroxypyr 180
intensity: N/A
Fluroxypyr EC
intensity: N/A
Fluroxypyr WDG
intensity: N/A
FX
intensity: N/A
Glean
intensity: N/A
GlyKamba
intensity: N/A
Glyphogan Plus
intensity: N/A
Impede
intensity: N/A
Inferno WDG
intensity: N/A
Integrity
intensity: N/A
Maverick III
intensity: N/A
Metsulfuron Methyl EUP Toss-N-Go
intensity: N/A
Nimble
intensity: N/A
Nimble WSB
intensity: N/A
Nuance
intensity: N/A
Nuance WSB
intensity: N/A
Nufarm Boost
intensity: N/A
Nufarm Fluroxypyr
intensity: N/A
Nufarm Glyphosate 360
intensity: N/A
Nufarm Spike 75
intensity: N/A
Nufarm Trophy 600 A
intensity: N/A
Nufarm Trophy 600 B
intensity: N/A
Optill
intensity: N/A
Perimeter
intensity: N/A
Perimeter II
intensity: N/A
Polaris
intensity: N/A
PP-31155
intensity: N/A
PrePass 480
intensity: N/A
Prestige XC A
intensity: N/A
Prestige XC B
intensity: N/A
Prestige XL
intensity: N/A
Pulsar
intensity: N/A
Reclaim II A
intensity: N/A
Reclaim II B
intensity: N/A
Refine Extra 75 DF
intensity: N/A
Refine Extra 75 Toss-N-Go
intensity: N/A
Refine SG
intensity: N/A
Refine SG Toss-N-Go
intensity: N/A
Restore A
intensity: N/A
Sencor 480 F
intensity: N/A
Sencor 500 Flowable
intensity: N/A
Sencor 75 DF
intensity: N/A
Sencor Solupak
intensity: N/A
Sentrallas
intensity: N/A
Signal F
intensity: N/A
Spitfire 50 SC
intensity: N/A
Tribenuron Methyl EUP DF 75
intensity: N/A
Triton Broadleaf
intensity: N/A
Vantage
intensity: N/A
Vantage MAX
intensity: N/A
Vantage Plus
intensity: N/A
Vantage Plus MAX
intensity: N/A
VP480
intensity: N/A
XRM-5171
intensity: N/A