Perennial thistle (Cirsium arvense)
Also known as:
Canada thistle
Perennial thistle is a prickly plant up to 1 m tall, with mauve flowers. It is a weed in pastures and crops.
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How does this weed affect you?
Perennial thistle, native of Europe, northern Africa and Asia, is an erect perennial thistle to 1.5m high.
Spread by seed and creeping roots, Perennial thistle, germinates in cooler months, dying back in autumn to re-shoot from root buds. Is a long-day plant requiring a photoperiod of at least 14 to 16 hours, depending on plant type, for flowering to commence.
Perennial thistle forms large colonies with dense growth crowding out desirable plants. It is a weed of pastures, crops, roadsides and wasteland in higher rainfall areas.
More information
Control
Herbicide options
WARNING - ALWAYS READ THE LABEL
Users of agricultural or veterinary chemical products must always read the label and any permit, before using the product, and strictly comply with the directions on the label and the conditions of any permit. Users are not absolved from compliance with the directions on the label or the conditions of the permit by reason of any statement made or not made in this information. To view permits or product labels go to the Australian Pesticides and Veterinary Medicines Authority website www.apvma.gov.au
Users of agricultural or veterinary chemical products must always read the label and any permit, before using the product, and strictly comply with the directions on the label and the conditions of any permit. Users are not absolved from compliance with the directions on the label or the conditions of the permit by reason of any statement made or not made in this information. To view permits or product labels go to the Australian Pesticides and Veterinary Medicines Authority website www.apvma.gov.au
See Using herbicides for more information.
2,4-D 300 g/L + Picloram 75 g/L
(Tordon® 75-D)
Rate: 650 mL per 100 L of water
Comments: Spot spray. Spray at budding stage.
Withholding period: Do not graze or cut crops (except sugar cane 8 weeks) or pastures for stock food for 7 days after application.
Herbicide group: I, Disruptors of plant cell growth (synthetic auxins)
Resistance risk: Moderate
2,4-D amine 625 g/L
(Various products)
Rate: 320–380 mL per 100 L of water
Comments: Spot spray.
Withholding period: 7 days withholding for grazing
Herbicide group: I, Disruptors of plant cell growth (synthetic auxins)
Resistance risk: Moderate
2,4-D amine 625 g/L
(Various products)
Rate: 3.2–3.8 L/ha
Comments: Boom spray. Rosettes to early budding stage.
Withholding period: 7 days withholding for grazing
Herbicide group: I, Disruptors of plant cell growth (synthetic auxins)
Resistance risk: Moderate
Dicamba 750 g/L
(Kamba® 750)
Rate: 185 mL per 100 L of water. Add a surfactant.
Comments: Spray prior to flowering. For non crop situations.
Withholding period: Do not harvest, graze or cut for stock food for 7 days after application.
Herbicide group: I, Disruptors of plant cell growth (synthetic auxins)
Resistance risk: Moderate
Dicamba 750 g/L
(Kamba® 750)
Rate: 2.7 L/ha Use a minimum of 1500 L of water per ha. Add a surfactant.
Comments: Boom spray for non-crop situations. Spray prior to flowering.
Withholding period: Do not harvest, graze or cut for stock food for 7 days after application.
Herbicide group: I, Disruptors of plant cell growth (synthetic auxins)
Resistance risk: Moderate
Fluroxypyr 140 g/L + Aminopyralid 10 g/L
(Hot Shot™ )
Rate: 500 mL in 100 L of water
Comments: Hand gun application.
Withholding period: Not required for pastures when used as directed. Do not graze or cut crops for stock food for 7 days after application. See label for export restrictions.
Herbicide group: I, Disruptors of plant cell growth (synthetic auxins)
Resistance risk: Moderate
Biosecurity duty
The content provided here is for information purposes only and is taken from the Biosecurity Act 2015 and its subordinate legislation, and the Regional Strategic Weed Management Plans (published by each Local Land Services region in NSW). It describes the state and regional priorities for weeds in New South Wales, Australia.
| Area | Duty |
|---|---|
| All of NSW | General Biosecurity Duty All pest plants are regulated with a general biosecurity duty to prevent, eliminate or minimise any biosecurity risk they may pose. Any person who deals with any plant, who knows (or ought to know) of any biosecurity risk, has a duty to ensure the risk is prevented, eliminated or minimised, so far as is reasonably practicable. |
For technical advice and assistance with identification please contact your local council weeds officer.
Reviewed 2021
