Perennial ragweed (Ambrosia psilostachya)

Profile

Impact

Perennial ragweed, native from Canada to Mexico, is a perennial herb to 1.5 m high. Spread by seed and stolons, which sends up shoots to form large dense colonies.

A weed of crops and pasture, Perennial ragweed, is not eaten by stock. It has an extensive root system making it difficult to control. Major cause of allergy with pollen causing flu-like symptoms; contact with the plant can also cause skin allergies.

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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.


Dicamba 500 g/L (Kamba® 500)
Rate: 600 mL in 100 L of water
Comments: Spot spray. Active growth, small rosettes.
Withholding period: 7 days.
Herbicide group: I, Disruptors of plant cell growth (synthetic auxins)
Resistance risk: Moderate


Dicamba 500 g/L (Kamba® 500)
Rate: 8.8 L/ha
Comments: Boom application.
Withholding period: 7 days.
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
Mid-Western Regional 4 Locally Controlled Weed
The growth of the plant must be managed in a manner that continuously inhibits the ability of the plant to spread

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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