Annual ragweed (Ambrosia artemisiifolia)

Annual ragweed invades roadsides, wastelands and poor or overgrazed pastures. It causes hay fever, asthma and skin allergies.


How does this weed affect you?

Annual ragweed is an introduced weed from North America that invades roadsides, wastelands and poor or overgrazed pastures. The pollen from this plant is a major cause of hay fever and can aggravate asthma. Contact with the plant can also cause skin allergies.

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Infestations can be minimised by maintaining healthy, dense pastures.

Biological control

Two biological control agents have been released for annual ragweed in New South Wales. A moth (Epiblema strenuana) is established and has a reasonable impact on annual ragweed. A beetle (Zygogramma bicolorata) is established and widespread, and has a significant impact at some sites.  

Herbicide options

Contact your local council weeds officer for control advice for Annual ragweed (Ambrosia artemisiifolia).

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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 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.
Northern Tablelands Regional Recommended Measure*
Land managers should mitigate the risk of new weeds being introduced to their land. Land managers should mitigate spread from their land. The plant should not be bought, sold, grown, carried or released into the environment.
*To see the Regional Strategic Weeds Management Plans containing demonstrated outcomes that fulfill the general biosecurity duty for this weed click here

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Reviewed 2017