White-Tail Spider in Adelaide — Identification, Treatment and What’s Actually True About the Bite

A white-tail spider (Lampona cylindrata) is the cylindrical, dark grey-brown spider with a small white tip on the abdomen that turns up in Adelaide laundries, shoes, beds and brick cavities. It is a wandering indoor spider that feeds on other spiders — particularly black house spiders — which is why mature Adelaide gardens with established black-house populations end up with a steady supply of them. The bite causes localised pain and a red mark; the long-running myth that the bite causes necrotic skin ulcers has been tested and found wrong. The 2003 Isbister and Gray prospective study of 130 confirmed white-tail bites recorded no cases of necrosis, and that finding has held up in the two decades since.

This guide explains how to identify a white-tail spider, where they appear in Adelaide homes, what the medical evidence actually says about the bite, and how a licensed treatment program clears them and keeps them out.

Identifying Lampona cylindrata — what an Adelaide white-tail looks like

Adult Lampona cylindrata is 12–18 mm body length, dark grey to charcoal-brown, with a long cylindrical abdomen. The marking that names the species is a small white or cream patch at the tip of the abdomen — sometimes a single spot, sometimes flanked by two pale dots earlier on the body. The legs have faint banding when viewed up close.

Two ID points that catch most homeowners out:

• Body shape, not just the white tip. Several Adelaide spiders have pale abdominal markings; the white-tail’s is paired with a long, smooth, almost tube-shaped abdomen. If the body is round and bulbous, it is not a white-tail.
• Behaviour. White-tails do not build webs to catch prey. They are active wanderers, usually seen on a wall, on bedding, or scuttling across the floor at night. A spider in a permanent web in a wall corner is more likely a black house spider — which the white-tail eats.

How it differs from other Adelaide spiders

Species	Size	Body shape	Behaviour
White-tail (Lampona cylindrata)	12–18 mm	Cylindrical, dark, white tip	Wanderer, no web
Black house spider (Badumna insignis)	15–18 mm	Stocky, dark, hairy	Lacy web in window frames, eaves
Huntsman (Sparassidae)	Up to 15 cm leg-span	Flat, large, sideways gait	Wanderer on walls and ceilings
Wolf spider (Lycosidae)	15–35 mm	Stocky, grey-brown, robust legs	Ground-active, no web

A clearer eye on the huntsman spider in Adelaide homes helps with the everyday confusion — huntsman are flat and fast, white-tails are slim and slow.

Where white-tails live in Adelaide homes

White-tails are indoor wanderers and they show up in the same handful of places across thousands of Adelaide call-outs:

• Laundries. Behind the washing machine, in folded towels, on the floor under the trough.
• Shoes left at the back door. A favourite daytime hideout. The standard advice — shake out shoes before putting them on — exists because of this species.
• Beds. Between sheets and on the underside of the doona at night, especially in spring and autumn.
• Wardrobes. Among hanging clothes and on the floor under shoes and bags.
• Brick cavities and weep-holes on external walls — entry-and-exit points to the indoor environment.
• Behind picture frames, bookshelves and skirtings — any narrow daytime harbourage.

The species is concentrated in south-east Australia, with Adelaide and Melbourne both inside the core range. Mature gardens with established black house spider populations under eaves and around windows sustain the local white-tail population. Eastern and southern Adelaide suburbs with older garden stock — Norwood, Unley, Burnside, Mitcham, Brighton, Glenelg — see white-tails reliably. New-build estates with sparse plantings see them less.

The bite — what’s true, what’s myth

The persistent myth is that a white-tail bite causes necrotic skin ulcers. Modern medical evidence does not support that claim. The definitive study — Isbister and Gray (2003), Medical Journal of Australia — followed 130 confirmed bites by Lampona cylindrata and L. murina (collected with the spider caught and identified by an expert) and found:

• No cases of necrotic skin lesions.
• Pain was the consistent feature — sometimes severe.
• Visible signs included a red mark or redness in 83% of cases and itchiness in 44%.
• A small puncture mark was visible in 17%.
• No confirmed bacterial infection from the bite itself.

The 97.5% confidence interval for necrosis in the study is less than 3%, which gives strong evidence against the necrosis link. Earlier media-driven cases of “white-tail bite causing flesh-eating ulcers” were not bites confirmed by spider capture and identification — they were attributed to white-tails after the fact, often misdiagnosed bacterial or vascular ulcers.

What this means for an Adelaide household:

• A confirmed white-tail bite hurts. It is not medically trivial — get it cleaned, watch for infection, see a GP if redness spreads or you develop systemic symptoms.
• It does not eat the flesh around the bite site. That outcome was never demonstrated under the experimental conditions where the spider was identified.
• If a wound starts to ulcerate, see a doctor. The cause is far more likely to be a bacterial infection, vascular issue, or another condition than a white-tail bite — but it needs medical attention regardless.

SA Health’s bites and stings guidance follows the same logic — clean the site, manage pain, monitor for infection, seek medical care for unusual symptoms.

Why Adelaide has more than most cities

White-tails track the distribution of their prey. Their main food is the black house spider (Badumna insignis) — the lacy-webbed spider in window frames, eaves, fence posts and brick mortar. Mature Adelaide gardens, especially the east and inner-south, hold high black-house populations, and that is what sustains the indoor white-tail wandering through houses at night.

Practically: clearing the underlying black-house web population is the long-term move. A surface treatment that knocks down white-tails without touching the food supply produces a temporary effect.

Treatment options for an Adelaide home

A reliable white-tail program is two-step — interior wandering-spider treatment + exterior food-source reduction — both delivered by a licensed Pest Management Technician using APVMA-registered chemistry.

What a licensed program looks like

• Internal residual perimeter. A non-repellent residual insecticide applied along skirtings, wardrobe interiors, behind appliances and around laundry plumbing. The spider walks across treated surfaces during night activity and picks up a lethal dose.
• Roof-void and wall-cavity dust. A registered insecticidal dust applied into the roof void and wall-cavity weep-hole entry points. Targets white-tails moving between the roof, wall cavity and living areas.
• External web treatment. Direct treatment of black-house webs in eaves, window frames, fence posts, garden sheds and outbuildings — both to remove the food source and to clear the visible web problem at the same time.
• Weep-hole and entry-point review. Identifying access routes from external brick cavities into the home; the technician notes where a builder-grade screen could be added if the homeowner wants to escalate.

What’s APVMA-registered for white-tails in Adelaide

Australian Pesticides and Veterinary Medicines Authority (APVMA)-registered products used for spider work in domestic settings include synthetic pyrethroid residuals (bifenthrin, deltamethrin), non-repellent indoor residuals, and insecticidal dusts (deltamethrin or permethrin formulations) for void application. A licensed technician selects the chemistry per label conditions, surface type and household sensitivity.

Pets and kids. Modern spider treatments are surface-applied at low concentrations and dry within an hour. The technician will brief on the standard re-entry window (typically 1–4 hours after application, longer for treated bedrooms) and the dust application is into voids and cavities — out of reach by design. Aquariums are covered or removed; food-prep surfaces are cleared and wiped post-service.

Why DIY usually fails

Retail surface sprays are repellent — they push the spider somewhere else rather than reach the harbourage. White-tails return through brick cavities and roof voids the surface spray never touches. Single-can fogger products do not penetrate the wall cavities and roof spaces where the resident spiders shelter. A one-shot retail treatment buys a few weeks of reduced sightings and the spider population restores.

For a single sighting in spring, a cup-and-card removal is usually fine. For repeated finds — same room, same week — a licensed program is the move.

Prevention — the long game

White-tail prevention is mostly about reducing harbourage and the food supply:

• Declutter laundries. Loose folded laundry, shoes, towels and rags piled on the laundry floor are the primary daytime hide.
• Shake out shoes and bedding before use, especially after a few days unworn or unmade.
• Clear black-house webs from eaves, window frames and fence corners every 6–8 weeks.
• Screen weep-holes if recurring entry from the brick cavity is documented.
• Fix gaps under door thresholds, around window architraves, and at skirting-to-floor junctions.
• Move beds away from walls by a small margin where possible; spiders walk along wall-floor junctions and prefer that route to crossing open carpet.

A pre-spring program (October–November) flattens the activity curve before the warm-weather wandering peak — the same timing that suits the wider summer pest pressure cluster.

When to call a licensed technician

• Repeated sightings in the same room within a week.
• A bite incident in the home — even with the bite myth dispelled, recurrent indoor activity is worth treating.
• Vulnerable household members — small children, elderly residents, severe arachnophobia.
• A property already on a quarterly pest program where the technician can roll spider work into a scheduled service.
• Pre-tenancy or pre-listing, where a clear visible spider history matters.

For pricing context, the pest control cost guide for Adelaide covers the typical range for spider-included general pest treatments and dedicated spider programs.

FAQ

Are white-tail spiders dangerous? A white-tail bite causes localised pain and a red mark; in confirmed bites studied prospectively, no necrotic skin lesions were recorded. The bite is not medically trivial — clean the site, manage pain, see a GP if redness spreads or systemic symptoms develop — but the long-running “flesh-eating” myth is not supported by the evidence.

Do white-tail spiders cause necrosis? No. The 2003 Isbister and Gray prospective study of 130 confirmed white-tail bites recorded zero cases of necrotic skin lesions. The 97.5% confidence interval for necrosis was less than 3%. Earlier media reports were of unconfirmed bites, frequently misdiagnosed bacterial or vascular ulcers attributed to white-tails after the fact.

How do I get rid of white-tail spiders in my Adelaide home? A licensed program combines internal residual perimeter treatment (skirtings, wardrobes, laundries), roof-void and wall-cavity insecticidal dust, external black-house spider web removal (the white-tail’s food source), and weep-hole entry-point review. DIY retail sprays clear the visible spiders briefly but do not reach the harbourage that sustains the population.

What attracts white-tail spiders to my house? Black house spiders. White-tails feed on them, and Adelaide gardens with established black-house populations under eaves, in window frames and around brick mortar sustain the indoor white-tail population. Cluttered laundries, shoes left at the back door, and undisturbed wardrobes provide the daytime harbourage that keeps them indoors.

Can pest control completely eliminate white-tails? A licensed program reduces the population to near-zero indoors and disrupts the outdoor food supply. Ongoing pressure from neighbouring gardens and brick-cavity entry points means a maintained outcome usually requires a quarterly or six-monthly service rather than a one-shot treatment, especially in mature east and south Adelaide suburbs.

Sources

• Isbister, G.K. & Gray, M.R. (2003). White-tail spider bite: a prospective study of 130 definite bites by Lampona species. Medical Journal of Australia, 179(4), 199-202: https://www.mja.com.au/journal/2003/179/4/white-tail-spider-bite-prospective-study-130-definite-bites-lampona-species
• Australian Museum — White-tailed Spider species page: https://australian.museum/learn/animals/spiders/white-tailed-spider/
• SA Health — Bites and Stings guidance: https://www.sahealth.sa.gov.au/wps/wcm/connect/public+content/sa+health+internet/conditions/poisoning/bites+and+stings