Advice to Householders - Spider Beetles
They have long antennae which are segmented and positioned
between the eyes, they have a spider like appearance, a stout body
with a hairy surface, a waist like constriction at the base of the
thorax and six long thin legs.
Australian Spider Beetle :- 2.5 - 4mm long, body is clothed
with dull brown to golden brown hairs.
Golden Spider beetle:- 3 - 4.5mm long body clothed in silky
golden-yellow hairs and fine scales.
Infestations often originate in birds nests. There are 2-4
generations per year and all stages except for the eggs and young
larvae can survive the winter.
The Golden spider beetle prefers moist places and can infest
textiles especially if they are soiled with grease. This is
becoming an increasing pest in domestic premises. Their peak
activity is between August and November.
Spider Beetles are gregarious and nocturnal, they spend the
days in cracks and crevices amongst packaging and the fabric of the
store. Consequently they can thrive in old buildings where they
find many harbourages.
Spider beetle larvae will infest all manner of dry animal and
vegetable matter including grain, spices, fish meal, dog biscuits,
dried fruit and a wide variety of miscellaneous debris. The larvae
bore holes in which to pupate and in so doing may damage packaging
and or the commodities. They also contaminate products with
droppings and silk webbing.
Adult beetles will damage products including bags and
The female lays up to 120 eggs over 3-4 weeks in early
The 4 eggs hatch in 3 - 30 days at 15-250C
Larvae live for 150 - 250 days then pupate
Pupation takes 18 - 30 days
Adults live for up to 12 months.