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Appearance & Life Span
There are many varieties in North America. All are easily recognizable by four pairs of legs and a large sac-like abdomen. The size of a spider generally ranges from 10 to 20 mm in length. Color varies from brown and gray to black.
Spiders are found year-round, but are more prevalent during warm months when their prey is readily available. In cold months spider activity drops off dramatically due to the lack of food. However, if the home has an infestation of another insect pest, spider activity will continue. Outside, the adult spider will die in cold months, but the young will over winter in a dormant state. Spiders are generally shy and are more likely to be found in lesser used areas of the home and property, such as basements, crawl spaces, closets, wood piles and under debris.
The female spider lays or carries approximately 250 eggs in a silken sac and up to nine sacs can be produced in a year. The young mature in about 40 days and are capable of reproduction. Under ideal conditions where food is plentiful, an infestation of spiders can number in the thousands.
Since spiders feed on other insects they are considered beneficial. There are no health concerns for this pest.