Canada

Burr ragweed

Ambrosia confertiflora

Erect perennial up to 2 m high and forming large colonies.

Leaves alternate, ± ovate to lanceolate, c. 16 cm long, 10–15 cm wide, bipinnately divided, lobes linear to lanceolate, green to grey-green, finely hairy.

Heads yellow-green; female heads 4 mm diam., abundant in massive clusters, each with 1 or rarely 2 florets. Bracts forming the fruit c. 4 mm long, covered with short hooked spines.

Pesticides
2,4-D Amine 500
intensity: ★★★
2,4-D LV-700
intensity: ★★★
Agri Star MCPA DMA 500
intensity: ★★★
Albaugh MCPA Ester 600 Liquid
intensity: ★★★
Arsenal
intensity: ★★★
Arsenal Powerline
intensity: ★★★
BASF Pyramin DF
intensity: ★★★
Betamix B FC
intensity: ★★★
Element
intensity: ★★★
Garlon 4
intensity: ★★★
Garlon Ultra
intensity: ★★★
Garlon XRT
intensity: ★★★
Pursuit Herbicide for Soybeans
intensity: ★★★
Remedy EC
intensity: ★★★
Remedy MSO
intensity: ★★★
Remedy XRT
intensity: ★★★
Rexade B
intensity: ★★★
Roundup Ultra Liquid
intensity: ★★★
Summit WG
intensity: ★★★
Traxos Two Broadleaf Component
intensity: ★★★
Attain A
intensity: N/A
Attain B
intensity: N/A
Attain XC A
intensity: N/A
Boost M
intensity: N/A
Carnival 540
intensity: N/A
Clearout 41 Plus
intensity: N/A
Credit 360
intensity: N/A
Credit 45
intensity: N/A
Credit Plus
intensity: N/A
Credit Xtreme
intensity: N/A
DPX-R9674 50 SG
intensity: N/A
Durango
intensity: N/A
Dycleer Agricultural
intensity: N/A
Elim EP 5 DF
intensity: N/A
Elim SG Toss-N-Go
intensity: N/A
Fluroxypyr 180
intensity: N/A
GF-184
intensity: N/A
GF-2018
intensity: N/A
GF-772
intensity: N/A
GF-871
intensity: N/A
Impede
intensity: N/A
Milestone
intensity: N/A
MON 76429 Liquid
intensity: N/A
MON 76431 Liquid
intensity: N/A
MON 76669 Liquid
intensity: N/A
MON 79791 Liquid
intensity: N/A
MON 79828 Liquid
intensity: N/A
Nimble
intensity: N/A
Nimble WSB
intensity: N/A
Nu-Image
intensity: N/A
Nufarm Boost
intensity: N/A
Nufarm Fluroxypyr
intensity: N/A
Nufarm Glyphosate 360
intensity: N/A
NuGlo
intensity: N/A
Polaris
intensity: N/A
Powermax Liquid
intensity: N/A
PP-31155
intensity: N/A
Princep Nine-T
intensity: N/A
Priority
intensity: N/A
Pulsar
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
Renegade HC Liquid
intensity: N/A
Roundup Transorb Liquid
intensity: N/A
Sentrallas
intensity: N/A
Signal F
intensity: N/A
Syna16003
intensity: N/A