Mites & spiders

Mites

Mites are minute (usually less than 1mm) arachnids with eight legs when adults. They are often pests of animals and plants, infest stored food products and in some cases transmit diseases.

Mites are a risk for Western Australian primary producers as they impact upon market access and agricultural production.

WA is free from some of the world's major agricultural mite pests. Biosecurity and management measures on your property are vital in preventing the spread of mites.

The Department of Primary Industries and Regional Development provides:

  • biosecurity/quarantine measures at the WA border to prevent the entry of mites
  • advice on widespread mites present in the state.

For advice on mites 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.

Spiders

Spiders are eight legged arachnids. They are not agricultural pests and do not spread disease or damage crops or food products. Spiders can play a beneficial role by feeding on pest insects. There are hundreds of species of spiders in Australia, with very few spiders that are potentially harmful.

Contact the Western Australian Museum for further information on spiders or Poisons Information on 13 11 26 for treatment of severe bites.

Articles

  • There are many hundreds of species of spiders in Australia which play a beneficial role in our environment by eating insect pests.

  • Adults are 0.6 millimetres long, red-brown with distinctly longer forelegs

    Brown wheat mite is an uncommon sap-sucking pest of cereals that is most active in dry warm weather.

  • Bananas in the Ord River Irrigation Area face two major insect pests (banana weevil borer and sugarcane bud moth) and two mites (russet and two-spotted).

  • Severe skin itching in humans can be caused by bites from species of straw itch mite.

  • Reddish-grey, pie-shaped body, with red legs and two long forelegs

    Bryobia mite, also known as clover mite, is a sap-sucking pest of broadleaf crops and pastures, that can seriously damage canola especially where there has been a 'green bridge' consisting of clove

  • Red legged earth mite and Blue Oat mite

    Field peas are very susceptible to mite damage at the seedling stage.

  • Lupin cotyledons become thickened and silvered

    Balaustium mite is a sucking pest of crops. Crops usually outgrow damage unless stressed.

  • The red dot on its back distinguishes blue oat mite from redlegged earth mite.

    Blue oat mites (BOM) are sap-sucking pest of crops and pastures. Canola and peas are particularly susceptible. Often co-exists with redlegged earth mites.

  • The most common mite pest of strawberry crops is two-spotted mite (Tetranychus urticae), also known as spider mite or red-spider mite.

  • Mites (Acari) are arthropods, a group that includes insects and spiders. Some mites are large enough to be visible to the naked eye while others can only be seen with a hand lens or microscope.