Pests, weeds & diseases

Pests, weeds and diseases pose a serious risk for primary producers as they can impact on market access and agricultural production.

To reduce the impact of pests, weeds and diseases, the Department of Primary Industries and Regional Development:

  • works with landholders, grower groups, community groups and biosecurity groups.
  • provides diagnostic services and information on prevention, management and treatment.
  • provides biosecurity and quarantine measures to prevent introduction, and to eradicate or manage current pests.

For advice on pests, weeds and diseases 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.


  • Witchweed (all non-indigenous Striga species) are declared pests in Western Australia (WA).

  • South African Cape rush (Elegia tectorum) is a declared pest in Western Australia (WA).

  • Doublegee, spiny emex, three corner jack (Emex australis

  • Cleavers, common bedstraw, stickywilly, goosegrass, catchweed bedstraw, robin-run-over-the-hedge, catch weed or scratch grass (Galium aparine) is a declared pest in Wester

  • Silverleaf nightshade (Solanum elaeagnifolium) is a declared pest in Western Australia (WA).

  • Senegal tea, temple plant, spade leaf plant (Gymnocoronis spilanthoides) is a declared pest in Western Australia (WA).

  • Praxelis (Praxelis clematidea) is a declared pest in Western Austral

  • Downy mildew of grapevines can cause serious crop loss if weather conditions are favourable.

  • Bunch rots of grapes are widespread in Western Australia and reduce yield and quality. Weather conditions and control strategies influence the severity of losses which can vary between vineyards.

  • Sclerotinia shoot rot is caused by the fungus Sclerotinia sclerotiorum.

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