Report the presence of this pest before undertaking control
Information about this pest can be found on the stemless thistle: declared pest page.
Chemical requirements
When using any agricultural chemicals please ensure that you always follow instructions on the label and any permit. Users of agricultural chemical products must always strictly comply with the directions on the label and the conditions of any permit. To view permits or product labels go to the Australian Pesticides and Veterinary Medicines Authority website.
Control options
Chemical control options can be found below. For other methods of control please refer to the aquatic weed control page, and the declared plant control handbook.
Chemical control options
Recommended herbicides | Cropping; prior to sowing:Chlorsulfuron; Triasulfuron Seedlings:2,4-D LV ester; 2,4-D amine; Dicamba Young-mature plants:Dicamba Up to two leaf stage:Tigrex® Rosette up to 10cm maximum diameter:Clopyralid Pasture; up to two leaf stage:Tigrex®; Dicamba Rosette up to 10cm maximum diameter:Clopyralid + MCPA At flowering:Glyphosate + 2,4-D LV ester/2,4-D amine; Paraquat |
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Herbicide: Chlorsulfuron (Group B) (various trade names: see APVMA link) | |
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Active ingredient | 750g/kg chlorsulfuron |
Rate of product/ha | 15-20g |
Time of application | Prior to sowing wheat and triticale |
Remarks | Only registered in South Australia |
More information and other control methods | These herbicides will damage clovers and medics |
Herbicide: Triasulfuron (Group B) (various trade names: see APVMA link) | |
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Active ingredient | 714g/kg triasulfuron |
Rate of product/ha | 30-35g |
Time of application | Prior to sowing wheat |
Remarks | Only registered in South Australia |
More information and other control methods | These herbicides will damage clovers and medics |
Herbicide: 2,4-D LV ester (Group I) (various trade names: see APVMA link) | |
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Active ingredient |
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Rates of dilution for spot spraying |
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Amount of product/10L water |
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Rate of product/ha |
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Wetting agent dilution | 1:600 |
Time of application | Winter-spring: seedling to small rosette stage |
Remarks | Pasture only. Thorough wetting is essential due to hairiness of leaf. Reaction to 2,4-D decreases as plants approach flowering. An APVMA permit is required to apply 2,4-D ester (80%) from 1 September until 1 May. |
More information and other control methods |
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Herbicide: Tigrex® | |
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Active ingredient | 250g/L MCPA (Group I) + 25g/L diflufenican (Group F) |
Amount of product/10L water | 10mL |
Rate of product/ha | 1L |
Wetting agent dilution | 1:400 |
Time of application | Up to two leaf stage |
Remarks | Cereals and pasture. May cause transient yellowing to cereals and should not be applied to clover pasture before three trifoliate leave. |
Herbicide: 2,4-D amine (Group I) (various trade names: see APVMA link) | |
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Active ingredient |
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Rates of dilution for spot spraying |
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Amount of product/10L water |
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Rate of product/ha |
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Wetting agent dilution | 1:600 |
Time of application | Winter-spring: seedling to small rosette stage |
Remarks | Pasture only. Thorough wetting is essential due to hairiness of leaf. Reaction to 2,4-D decreases as plants approach flowering, rates should be increased above those recommended. |
More information and other control methods |
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Herbicide: Dicamba (Group I) (various trade names: see APVMA link) | |
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Active ingredient | 200g/L dicamba |
Rates of dilution for spot spraying | 1:750 - seedlings 1:375 - mature plants |
Amount of product/10L water | 15mL - seedlings 30mL - mature plants |
Rate of product/ha | Grass pasture only 1.5L - seedlings 3.0L - mature plants |
Time of application | Seedlings |
More information and other control methods | A 500g/L formulation – use 1.2L/ha. Also a 750g/kg formulation (Cadence) is available. Apply at 200-400g for seedlings, and 400-800g for young to mature plants. |
Herbicide: Clopyralid (Group I) (various trade names: see APVMA link) | |
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Active ingredient |
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Rate of product/ha |
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Wetting agent dilution | 1:400 |
Time of application | Rosette up to 10cm maximum diameter |
Herbicide: Glyphosate (Group M) + 2,4-D ester (Group I) (various trade names: see APVMA link) | |
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Active ingredient | 360g/L glyphosate + 800g/L of 2,4-D ester. Other concentrations of glyphosate and 2,4-D ester available. |
Rate of product/ha | 400mL of glyphosate + 500mL of 2,4-D ester. Adjust rates for another concentrations of glyphosate and 2,4-D ester. |
Time of application | At flowering |
Remarks | Not recommended for south west Western Australia because of risk to commercial vines and vegetables. An APVMA permit is required to apply 2,4-D ester (80%) from 1 September until 1 May. |
More information and other control methods | Other formulations of glyphosate available |
Herbicide: Paraquat (Group L) (various trade names: see APVMA link) | |
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Active ingredient | 200g/L paraquat |
Rate of product/ha | 2L/ha |
Time of application | At flowering |
Remarks | If plants actively growing they will recover and continue flowering |