Orb weaver spider day web

Image via Wikipedia

At this year’s New York Pest Expo we were honored to have Dr. Bill Robinson of B&G Equipment share with us his insights on the Biology and Control of Household Spiders. He helped us learn more about the common species known to inhabit homes.

Spiders are everywhere and may be a health threat because every spider is venomous to a degree. Every spider can bite and will inject a foreign protein.  They are difficult to control because spiders don’t have tarsal pads like a cockroach and, therefore, a residual insecticide may not affect them.  Spiders are also seasonal. They are more prominent in the spring and fall.

Some common everyday spiders we see here in the US are:

  • Cellar spiders – Very thin and small. You may see many webs and find a few hanging upside down from them.
  • Wolf spiders – Don’t make a web. They hunt for their food. They are above average in size.
  • House spiders – Collect dust to build their webs
  • Ground spiders – They are common where there’s mulch.
  • Yellow sac spiders – Very good climbers and are quite common.
  • Orb weaver – Huge! They are relatively harmless but create large webs. They are found outside by light sources.

Dust applications will work. The hairier the spider leg the more likely it is for dust to work. Bill recommends crack and crevice applications with silica dust, diatomaceous earth, and pyrethroids. Sticky traps are also great tools.

  1. Lou Sorkin says:

    Not every spider injects venom when biting and members of one family don’t possess venom glands.
    The vast majority of spiders actually don’t pose a health threat at all.
    Many spider species do have tarsal pads between the claws and even may have tarsal and metatarsal pads as well. Yellow sac spiders and wolf spiders are examples of spiders with such pads. Jumping spiders have pads, too.
    Our common cobweb spider gets dust stuck in its web, doesn’t collect it and place in web.

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