Spider Beetle

Print page

Classification: 

Species category: Beetles & Weevils

Family: Ptinidae


Description
There are 4 key species: 

1. Ptinus tectus (Australian Spider Beetle)
2. Ptinus fur (White Marked Spider Beetle)
3. Niptus hololeucus (Golden Spider Beetle)
4. Gibbium psylloides (Hump Spider Beetle)

Varying in size by species, these insects are on average 1.7-4mm in length and have a dull-brown/red body with golden hairs. The Hump Spider beetle is different and has a shiny, red-brown to black body with no hairs.

Spider Beetles have 11 segmented antennae and all share a number of spider-like characteristics including a stout body, long legs and generally, a hairy appearance.

Behaviour:
Gregarious and nocturnal, Spider Beetles spend the day in cracks and crevices amongst packaging and the fabric of a building. They thrive in old buildings where they find safe harbourages.

Spider beetle larvae infest all types of dry animal and vegetable matter including grain, spices and fish meal. They will scavenge on debris and bore holes in order to find a safe place to pupate. In doing so, they destroy packaging and contaminate foods.

There are 2-4 generations per year in unheated conditions. All stages except eggs and young larvae can overwinter. Peak activity is reached between August and November.

Region:
The Australian Spider Beetle is Australasian in origin and now is widely distributed. Most spider beetle species are cosmopolitan and are rarely imported.

Habitat:
They enjoy dark and damp conditions and readily feed on moisture-damaged food. Infestations often originate from birds’ nests. Spider beetles are becoming increasingly common in domestic premises where they are found in attics, wall cavities and floorboard cracks.

Granaries and bakeries also offer the perfect conditions and food sources. Hump Spider beetles are tolerant of cool conditions and can survive for long periods without food supplies.

Risks:
Spider beetles can reduce the quality of commodities by contaminating them with webbing and droppings. The larvae bore into packaging and the grain itself, in addition to other materials such as grain sacks, leaving behind tell-tale holes.

White Footed Ant

White Footed Ant

A small, dull, and cloudy-black coloured ant which can...

See pest
Fire Ant

Fire Ant / Red Imported Fire Ant

The Red Imported Fire Ant (RIFA) has a copper brown head...

See pest
Ghost Ant

Ghost Ant

Very small ants, the workers are 2mm long and have a pale,...

See pest
Black House Ant

Black House Ant

They have a preference for sugary liquids and will tend to...

See pest
Clothes Moth

Clothes Moth

They are typically 7–8 mm in length when the wings are...

See pest
Spider

Spider

Most spiders are harmless and play an important role in...

See pest

Brown-banded Cockroach

adults and nymphs have two brownish, broad bands across the...

See pest
Flea

Flea

Adult fleas live exclusively as parasites of warm blooded...

See pest
Silverfish

Silverfish

Silverfish are nocturnal and secretive insects that are...

See pest
American Cockroach

American Cockroach

Gregarious and nocturnal, they spend the day hiding in...

See pest
Bed Bug

Bed Bugs

See pest
German Cockroach

German Cockroach

German cockroaches are faster and smaller than other...

See pest
Meat Ant

Odorous Garden Ant

Typically omnivores, they can eat proteins and will...

See pest
Pharaoh Ant

Pharaoh Ant

This small ant is yellow-brown in colour with...

See pest
Oriental Cockroach - Pest Control - Bayer

Oriental Cockroach

It is most commonly found around the ground-floor of...

See pest