Weeds pose a serious risk for primary producers as they can impact on market access and agricultural production.

In 2006/07, each Western Australian agricultural business spent an average of $29 376 ($341 million total) on weed control (Australian Bureau of Statistics).

Weed control is a shared responsibility between landholders, grower groups, biosecurity groups and the Department of Primary Industries and Regional Development.

To protect WA’s agriculture, the department:

  • works with landholders, grower groups, community groups and biosecurity groups
  • regulates weeds under the Biosecurity and Agriculture Management Act 2007
  • provides a weed identification service
  • provides a predictive simulation tool called weed seed wizard
  • provides information on weed control, crop weeds, regulated/declared plants and herbicides
  • contributes to social science through weedwatcher.

For advice on weeds search our website, the Western Australian Organism List or contact our Pest and Disease Information Service (PaDIS).

For diagnostic services, please contact our Diagnostic Laboratory Services.


  • Results from a two-decade annual survey continue to show the success of harvest weed seed control as a part of broadacre farmers’ integrated weed management strategy in the Geraldton region.

  • African clubmoss (Selaginella kraussiana), also known as Selaginella, or spreading clubmoss, is an invasive fern ally that forms extensive dense carpets in damp sites.

  • The Chemical weed control in canola bulletin has been produced by the Department of Primary Industries and Regional Development, with co-investment from the Grains Research and Development Corporat

  • Mimosa, giant sensitive tree, catclaw plant or bashful plant (Mimosa pigra) is a declared pest in Western Australia (WA).

  • Sagittaria (Sagittaria platyphylla) is a declared pest in Western Australia (WA).

  • Ragwort, stinking willie, St James wort, tansy ragwort (Senecio ja

  • Physic nut, Barbados nut, curcas bean, purge nut, purging nu

  • Kochia, summer cypress (Bassia scoparia) is a declared pest in Western Australia (WA).

  • Hydrocotylwater pennywort, hydrocotyle, floating marshpennywort, spaghetti weed, grote waternavel (

  • Horsetail, common horsetailbottlebrush, field horsetail, horse pipes, mare's tail, snake grass, shave grass, scouring rush

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