Pestipedia - Our Pest Resource Guide

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Cellar Spiders

Pest Description

What is a Cellar Spider?
Cellar spiders are usually found in dark corners of cellars, crawl spaces, and garages. They are very long-legged and often confused with daddy-long-legs. However, they are true spiders that spin untidy webs which are often quite extensive. These are the spider webs that Hollywood creates in bad horror films. When disturbed, they characteristically vibrate or shake in the web. Female cellar spiders carry eggs by her jaws in a loose silk sac until they hatch. Female long-bodied cellar spiders produce about three egg sacs over a lifetime, each containing 13-60 eggs each. Once the eggs hatch the spider lings crawl onto the mother’s body for a short time. Development from egg to adult usually takes about one year. Adult cellar spiders may live for an additional two years.

In instances where cellar spiders are pests, it is due to the large amounts of webbing they produce. Many species of spiders consume their old web before making a new one, but cellar spiders do not. They continuously add to it, creating large amounts of webbing which becomes a nuisance to remove. Cellar spiders construct loose haphazard webs, often in corners, to catch insect prey. They hang upside down on the web until a food item gets tangled.


Why Should I Care?
Although their bites are harmless to humans, their webs are unsightly and profuse: unlike other spider species, cellar spiders prefer to live within close proximity to one another, creating troublesome communities within human dwellings. They also lay lots of eggs and the webs can get out of control quickly if not taken care of.


What Would Portland Pest Guard Do?
In cases involving considerable numbers of spiders, a spider control professional from Portland Pest Guard should be consulted. We use our knowledge of these critters to find the locations of the spiders, webs, eggs, and properly extinguish them.

Give us a call today at 503.720.8559 to learn more about Cellar Spiders or to schedule
an inspection!



*Portland Pest Guard provides pest control service to most cities in Western Oregon and Southern Washington. Including: Beaverton, Cedar Mill, Gresham, Lake Oswego, McMinnville, Portland, Tigard, Vancouver and surrounding areas.