Spiders

 

Spiders are members of the class Arachnida. Other members include ticks, mites and scorpions. Generally, spiders have eight legs, two-part bodies, fangs, and organs that spin webs. Spiders are essential to our ecosystem as they prey on insects and keep their populations under control.

Australia has about 2,000 species of spider, but most are relatively harmless to humans. Funnel-web spiders (indigenous to Sydney) and red-back spiders (found throughout the country) are perhaps the most venomous spiders in Australia.

 

Spider bites and venom


Most spiders have venom. A spider uses venom to paralyse its prey – usually flies and other insects. However, a spider that feels frightened or threatened by a human may bite. In most cases, spider fangs are not strong enough to break the skin. If the fangs do break the skin, the venom usually has no effect on the human body. The pain of most spider bites can be managed with an icepack.

The few Australian spiders that can cause potentially harmful bites include the funnel-web, the mouse, the red-back and the white-tailed spiders. People at greater risk of severe reactions to spider venom include babies, young children, the elderly and people with an existing heart condition.

 
Favoured locations of venomous spiders
 

To assess your family’s risk of spider bites, familiarise yourself with the kinds of spider that tend to live around your home and garden. Each species of spider has a preferred home or hunting ground.Signs you should look for include:

 

  • Mouse – found all over Australia. It likes to live near water in ground holes that feature right-angled ‘trap doors’. Males are coloured either red on the jaw or bluish-white on the abdomen. Females are larger than the males.

  • Red-back – found across Australia, but is less common in cooler climates. It looks shiny black with a red or orange marking on the abdomen. Only the female bite is venomous. The red-back does not live in the ground; instead, it chooses ‘man-made’ sheltered areas such as inside sheds or beneath stairs. The web is usually made in the shade. The top of the web contains a thickly spun ‘cone’, where the spider sits. Red-backs are not aggressive. Most bites occur when people accidentally put their hand in the web and the spider feels threatened.

  • White-tailed – found across Australia. It is coloured grey to black with a white patch on the abdomen. It does not build a web. The white-tailed spider is commonly found in cool and tiled areas such as bathrooms and laundries, and may hide inside shoes, clothes and other items left on the floor. Outdoors, it lives under bark and logs and in leaf litter. It is nocturnal.

  • Funnel-web – found along the East Coast from Queensland to Tasmania and in some areas of South Australia. It likes to live in holes in moist soil, such as in mulched garden beds. Erratic (rather than symmetrical) web lines may fan out from the hole. Males tend to roam for females in autumn and summer. The funnel web is nocturnal (comes out at night). The male Sydney funnel-web is considered to be Australia’s most dangerous spider, and is the only type of funnel-web responsible for recorded human deaths. The Sydney funnel-web is not found in Victoria.

 
Common but relatively harmless spiders
 

Some spiders may look scary, but are not dangerous to most people. Common examples include:

  • black house – found in eastern and southern Australia. It may be found under tree bark and around windowsills. The webs are formed in messy ‘sheets’

  • huntsman – likes to live under bark, rocks and crevices. The two front pairs of legs are much longer than the back two pairs of legs. Despite its size, a huntsman is usually harmless. A bite, however, may cause some swelling and pain

  • wolf – found across Australia. It is coloured brown to grey. The wolf spider has a distinctive set of six ‘eyes’ at the fore of its body. Typical symptoms of a wolf spider bite include some itching and pain.

 

Spider-proof your home

 

It may be impossible to eradicate spiders from your garden, but you can stop most spiders from living in your house. Suggestions include:

  • Clear away trees, shrubs and bushes from around doors or windows.

  • Avoid the use of insecticides in the garden, as spiders may be encouraged to flee into the house.

  • Fit draught-strips to all doors. Spiders may crawl in under doors.

  • Install flyscreens to windows and any vents, such as wall ventilation slots.

  • Don’t leave equipment or clothing (such as shoes) outside. If you do, shake out before you wear them or bring them inside the house.

  • Keep the windows of your parked car wound up to avoid being surprised by a spider while you’re driving.

  • Pour boiling water (from a kettle) into any spider holes you find near doorways and windows. This will kill the spider.

  • Consult with a licensed pest control operator for professional advice.

 

Source: Better Health Channel

www.betterhealth.vic.gov.au

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PO Box 562 Manjimup WA 6258 | Tel: Connor De Campo 0467 663 002 | Josh De Campo 0459 661 244 | Email: info@sfpestcontrol.com.au 

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