Life Cycles

Grey house spider

The female lays a lot of eggs which are then covered with silk to form small paper brown egg sacks. the female may produce 1 or 2 egg sacks.

The young, or spider lings, hatch in large numbers and through the a number of moults, reach sexual maturity in nine months. There is usually one generation each year.

White-kneed spider

The eggs laid by the adult female are covered silk to form a white, flattened, star shaped egg sack. There maybe several egg sack in the web.

The young hatch into spiderlings that go through a series of moults to reach the adult stage. Like the grey house spider, there is usually, only one generation per year.

Daddy-Long-Legs Spiders

The female carries the eggs, which are loosely woven together. The young spiderlings pass through a series of moults until reaching adult stage, usually in summer. there is normally only one generation per year.

Redback Spiders

The female lays her eggs and covers them with silk to form a pale brown spherical egg sack. these sacks are hung in the upper part of the web. Each female producers 3 to 4 egg sacks and each may contain up to 300 eggs.

The potentially high spider population is limited by a small parasite wasp, and by cannibalism. The surviving spiderlings float away on gossamer threads to set up homes of their own. Heavy rains and the attack from birds further depletes the populations.

The spider mature in early summer, and lay their eggs in mid to late summer and then hatch in autumn, and there appears to be only one generation per year.

Control

Regular inspection and destruction of spiders and their webs is a cheap and effective way to keep building reasonably free of spiders.

Chemical Control

When applying insecticides, the spray should be directed at the spider. Their habits of sitting in the middle of their web with out coming in contact with the surface of a wall and such, make residual sprays less effective.

Special advice on Redback Spiders

Redbacks are not aggressive spiders, they rarely leave their nest. It is only when a hand or another part of the body disturbs the nest that they will bite. Fatalities are rare. Since the introduction of the antivenin no deaths have been recorded.

Symptoms of a bite

A light sting is felt when a redback bite. This is followed by immediate itching, and then the gradual onset of possible severe pain. After 20 to 30 mins the body temperature rises and nausea and vomiting occurs. Profuse sweating, as well as inflammation and swelling of near by lymph glands with the progressive muscular weakness are also symptoms.

First Aid

  • Keep all movement to a minimum.
  • Wash the wound
  • Do not apply tourniquet
  • Take victim to nearest hospital immediately