Perennial thistle (Cirsium arvense)

Also known as: Canada thistle

Profile

Impact

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.

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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

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: 1-8 weeks (see label).
Herbicide group: I, Disruptors of plant cell growth (synthetic auxins)
Resistance risk: Moderate


2,4-D amine 625 g/L (Amicide® 625)
Rate: 320–380 mL per 100 L of water
Comments: Spot spray.
Withholding period: 7 days.
Herbicide group: I, Disruptors of plant cell growth (synthetic auxins)
Resistance risk: Moderate


2,4-D amine 625 g/L (Amicide® 625)
Rate: 3.2–3.8 L/ha
Comments: Boom spray. Rosettes to early budding stage.
Withholding period: 7 days.
Herbicide group: I, Disruptors of plant cell growth (synthetic auxins)
Resistance risk: Moderate


Dicamba 500 g/L (Kamba® 500)
Rate: 280 mL per 100 L of water
Comments: Spot spray. Young, actively growing plants.
Withholding period: 7 days.
Herbicide group: I, Disruptors of plant cell growth (synthetic auxins)
Resistance risk: Moderate


Dicamba 500 g/L (Kamba® 500)
Rate: 4 L/ha
Comments: Boom spray.
Withholding period: 7 days.
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: 7 days. See label for export restrictions.
Herbicide group: I, Disruptors of plant cell growth (synthetic auxins)
Resistance risk: Moderate


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Legal requirements

The content provided here is for information purposes only and is taken from the Noxious Weeds Act 1993.

Area Class Legal requirements
Snowy Monaro Regional 3 Regionally Controlled Weed
The plant must be fully and continuously suppressed and destroyed

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For technical advice and assistance with identification please contact your local council weeds officer.
For further information call the NSW Invasive Plants and Animals Enquiry Line on 1800 680 244 or send an email to weeds@dpi.nsw.gov.au

Reviewed 2014