Agrobase Canada
European stickseed (bluebur, bristly sheepbur)
Lappula squarrosa

It is native to Europe and Asia, where it is common, and it is an introduces species in much of North America and Africa. It is well known as a noxious weed where it is naturalized and also in many parts of its native range. This is an annual herb producing an erect stem often with sprays of many long, bending branches, its form varying in different regions and climates. The plant may approach a meter in height. The stems are lined with linear to oval leaves up to 5 centimeters long and coated in whitish hairs, and the herbage emits a scent generally considered unpleasant. The inflorescence  is a long, leafy raceme of tiny flowers near the ends of the branches. Each flower is 2 to 4 millimeters wide with five light blue corolla lobes. White-flowered plants are occasionally seen. The fruit is a cluster of four nutlets which are coated in hooked prickles. The seeds are dispersedwhen the prickles get caught on animal coats and human clothing, and when they are moved by wind.This plant grows easily in a wide range of habitat types, including agricultural fields, roadsides, gravel beds, and rocky waste places. It thrives in overgrazed pastures.

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: ★★★
Accurate WSB
Efficiency: ★★★
Adrenalin SC
Efficiency: ★★★
Agri Star 2,4-D Ester 700
Efficiency: ★★★
Albaugh 2,4-D Amine 600
Efficiency: ★★★
Albaugh 2,4-D Amine 600 Liquid
Efficiency: ★★★
Ally 20 SG
Efficiency: ★★★
Ally Herbicide Dry Flowable 60
Efficiency: ★★★
Ally Herbicide Toss-N-Go
Efficiency: ★★★
Attain XC B
Efficiency: ★★★
Benchmark B
Efficiency: ★★★
Buctril M
Efficiency: ★★★
Clearview
Efficiency: ★★★
Compas 480 EC
Efficiency: ★★★
Enlist Duo
Efficiency: ★★★
Estaprop XT
Efficiency: ★★★
Formula 40 C
Efficiency: ★★★
Frontline 2,4-D XC A
Efficiency: ★★★
Frontline 2,4-D XC B
Efficiency: ★★★
GF-2654 TC
Efficiency: ★★★
GF-2654 TSOY
Efficiency: ★★★
GF-2726 TSOY
Efficiency: ★★★
GF2050
Efficiency: ★★★
MCPA Amine 600
Efficiency: ★★★
MCPA-K
Efficiency: ★★★
MCPA Sodium 300
Efficiency: ★★★
Metsulfuron Methyl EUP
Efficiency: ★★★
Metsulfuron Methyl EUP Toss-N-Go
Efficiency: ★★★
Mextrol 450
Efficiency: ★★★
Navius
Efficiency: ★★★
Navius VM
Efficiency: ★★★
OcTTain XL
Efficiency: ★★★
Pardner
Efficiency: ★★★
Restore B
Efficiency: ★★★
Restore II
Efficiency: ★★★
Retain B
Efficiency: ★★★
Rexade B
Efficiency: ★★★
Roundup Ultra Liquid
Efficiency: ★★★
Scuttle
Efficiency: ★★★
Sightline A
Efficiency: ★★★
Thumper
Efficiency: ★★★
Traxos Two Broadleaf Component
Efficiency: ★★★
Truvist
Efficiency: ★★★
Agri Star MCPA DMA 500
Efficiency: ★★
Boost M
Efficiency: ★★
Enforcer M
Efficiency: ★★
MCPA 2 EH Ester 600
Efficiency: ★★
MCPA Amine
Efficiency: ★★
MCPA DMA 500
Efficiency: ★★
MCPA Ester 500
Efficiency: ★★
MCPA Ester 500 LV
Efficiency: ★★
MCPA Ester 600
Efficiency: ★★
Albaugh MCPA Ester 600 Liquid
Efficiency: ★
Plus M Ester 600
Efficiency: ★
Stellar B
Efficiency: ★
Approve
Efficiency: not_available
Attain A
Efficiency: not_available
Attain B
Efficiency: not_available
Attain XC A
Efficiency: not_available
Badge II
Efficiency: not_available
Baseline A
Efficiency: not_available
Benchmark A
Efficiency: not_available
Blackhawk
Efficiency: not_available
Bromotril 11 240 EC
Efficiency: not_available
BRY/MAE 2 (A Component of RRR/BRY/MAE Herbicide Tank Mix)
Efficiency: not_available
Carnival 540
Efficiency: not_available
Credit 360
Efficiency: not_available
Credit 45
Efficiency: not_available
Credit Xtreme
Efficiency: not_available
Durango
Efficiency: not_available
Fluroxypyr 180
Efficiency: not_available
Fluroxypyr EC
Efficiency: not_available
Fluroxypyr WDG
Efficiency: not_available
FX
Efficiency: not_available
GF-2018
Efficiency: not_available
GF-772
Efficiency: not_available
GF-871
Efficiency: not_available
GlyKamba
Efficiency: not_available
Koril 235
Efficiency: not_available
Milestone
Efficiency: not_available
MON 76429 Liquid
Efficiency: not_available
MON 76431 Liquid
Efficiency: not_available
MON 76669 Liquid
Efficiency: not_available
MON 79791 Liquid
Efficiency: not_available
MON 79828 Liquid
Efficiency: not_available
Nufarm Fluroxypyr
Efficiency: not_available
Nufarm Glyphosate 360
Efficiency: not_available
NuGlo
Efficiency: not_available
Perimeter
Efficiency: not_available
Perimeter II
Efficiency: not_available
Polaris
Efficiency: not_available
Powermax Liquid
Efficiency: not_available
Reclaim II A
Efficiency: not_available
Reclaim II B
Efficiency: not_available
Renegade HC Liquid
Efficiency: not_available
Restore A
Efficiency: not_available
Roundup Transorb Liquid
Efficiency: not_available
RRR 1 (A Component of RRR/BRY/MAE Herbicide Tank Mix)
Efficiency: not_available
Sentrallas
Efficiency: not_available
Signal F
Efficiency: not_available
Spitfire 50 SC
Efficiency: not_available
Thrasher
Efficiency: not_available
Thrasher II
Efficiency: not_available
Thumper Total 1 (A Component of Thumper Total Herbicide Tank Mix)
Efficiency: not_available
Thumper Total 2 (A Component of Thumper Total Herbicide Tank Mix)
Efficiency: not_available