Resistance has been confirmed to at least one herbicide mode of action group in Australia in the following weeds:

Grass WeedsGROUPSSITES
Annual ryegrass (Lolium rigidum)
Annual ryegrass (Lolium rigidum)
Annual ryegrass (Lolium rigidum)
Annual ryegrass (Lolium rigidum)
Annual ryegrass (Lolium rigidum)
Annual ryegrass (Lolium rigidum)
Annual ryegrass (Lolium rigidum)
Annual ryegrass (Lolium rigidum)
A
B
C
D
J
L
M
Q
>20,000
>20,000
>50
>5000
20
20
>1000
3
Annual veld grass (Ehrharta longiflora)A6
Awnless barnyard grass (Echinochloa  colona)M>200
Barnyard grass (Echinochloa crus-galli)C1
Barley grass (Hordeum spp.)
Barley grass (Hordeum spp.)
Barley grass (Hordeum spp.)
A
B
L
>200
>200
>100
Brome grass (Bromus spp.)
Brome grass (Bromus spp.)
Brome grass (Bromus spp.)
A
B
M
>200
>1000
5
Crabgrass (Digitaria sanguinalis)
Crabgrass (Digitaria sanguinalis)
A
B
2
1
Crowsfoot grass (Eleusine indica)A
L
1
5
Feathertop Rhodes grass (Chloris virgata)M4
Giant Parramatta grass (Sporobolus fertilis)J6
Lesser Canary grass (Phalaris minor)
Lesser Canary grass (Phalaris minor)
A
B
20
10
Liverseed grass (Urochloa panicoides
Liverseed grass (Urochloa panicoides)
C
M
7
4
Paradoxa grass (Phalaris paradoxa)
Paradoxa grass (Phalaris paradoxa)
A
B
7
4
Serrated tussock (Nassella trichotoma)J2
Silver grass / Squirrel-tailed fescue (Vulpia bromoides)
Silver grass / Squirrel-tailed fescue (Vulpia bromoides)
C
L
3
1
Sweet summer grass (Brachiaria eruciformis)M1
Wild oat (Avena spp.)
Wild oat (Avena spp.)
Wild oat (Avena spp.)
A
B
Z
>5000
>200
>200
Windmill grass (Chloris truncata)M13
Winter grass  / Annual poa (Poa annua)Z
D
1
>20
BROADLEAF WEEDSGROUPSSITES
African turnip weed (Sisymbrium thellungii)B2
Arrowhead (Sagittaria montevidensis)B20
Bedstraw / Cleavers (Galium aparine)B3
Black bindweed (Fallopia convolvulus)B2
Blackberry nightshade (Solanum nigrum)L2
Calomba daisy (Oncosiphon suffruticosum)B2
Capeweed (Arctotheca calendula)I
L
1
1
Charlock (Sinapis arvensis)B2
Common sowthistle (Sonchus oleraceus)
Common sowthistle (Sonchus oleraceus)
Common sowthistle (Sonchus oleraceus)
B
I
M
>10000
5
28
Dense-flowered fumitory (Fumaria densiflora)D2
Dirty Dora (Cyperus difformis)B>50
Flax-leaf fleabane (Conyza bonariensis)M
B
L
>100
70
1
Iceplant (Mesembryanthemum crystallinum)B2
Indian hedge mustard (Sisymbrium orientale)
Indian hedge mustard (Sisymbrium orientale)
Indian hedge mustard (Sisymbrium orientale)
Indian hedge mustard (Sisymbrium orientale)
B
C
F
I
>1000
16
18
>50
Lincoln weed / Sand rocket (Diplotaxis tenuifolia)B20
Paterson’s curse (Echium plantagineum)B2
Pennsylvania cudweed (Gamochaeta pensylvanica)L2
Prickly lettuce (Lactuca serriola)B
M
>1000
1
Small square weed (Mitracarpus hirtus)L1
Starfruit (Damasonium minus)B5
Stinging nettle / Dwarf nettle (Urtica urens)C1
Tall Fleabane (Conyza sumatrensis)M10
Tridax daisy (Tridax procumbens)M1
Turnip weed (Rapistrum rugosum)B3
Wild radish (Raphanus raphanistrum)
Wild radish (Raphanus raphanistrum)
Wild radish (Raphanus raphanistrum)
Wild radish (Raphanus raphanistrum)

Wild radish (Raphanus raphanistrum)
B
C
F
I
M
>5000
>20
>200
>1000
3
Wild turnip / Mediterranean turnip (Brassica tournefortii)B>100

CropLife acknowledges the assistance of Dr Chris Preston (University of Adelaide) in compiling this list. If you suspect a case of herbicide resistance that is not on this list please notify Dr Preston at [email protected]  so that he can maintain a register of herbicide resistance in Australia.

These observations are independent of registered label claims for these herbicide mode of action groups.

 

CropLife Australia’s Resistance Management Strategies provide a guide for crop protection product rotation through product groups.  The strategies are a useful tool that supports farmers’ adoption of resistance management.

All crop protection products must be handled and applied strictly as specified on the product label or APVMA permits.  These Resistance Management Strategies do not replace product labels.  They are a guide only and do not endorse particular products, groups of products or cultural methods in terms of their performance.  It is important to check with the Australian regulator’s (APVMA) product database for contemporary information on products and active constituents.  The database can be sourced through www.apvma.gov.au