Spiders in Your House (Class Arachnida)
Information About Seattle Area Spiders
Spider in house? Not a surprise... House Spiders are a Common Pest Problem! There are several types of spiders that reside in the Pacific Northwest. The most common by far is the House Spider. The House Spider is so-named because of the fact that this is usually the spider most often seen indoors. It is a nuisance pest, probably more because of its webs than the spider itself. This spider is found worldwide and is common throughout the United States and Canada.
For these reasons, spider pest control is commonly required by homeowners throughout the greater Seattle area. To learn more about proven, affordable spider removal services offered by Eastside Exterminators, call 425-482-2100
Biology of House Spiders
Adult female body length ranges from 3/16”-5/16”, including an almost spherical abdomen. Male body length ranges from 1/8”-3/16”, including an elongated abdomen. Their color is highly variable. The carapace, which is the top side of a spider’s rear section, is usually yellowish brown. The abdomen is usually dirty white with a few dark spots (sometimes with a black triangular spot in center of dorsum) to almost black, with several dark stripes meeting at angle medially (“army sergeant stripes”) above tip of abdomen. Legs tend to be orange in males but yellow in females, with dusky rings at the end of each segment. House spiders have eight eyes arranged as two clusters of two lateral pairs almost touching.
Female house spiders lay about 250 eggs in a silken sac which is brownish, oval-shaped, and about 1/4-3/8″ in diameter. It notable has a tough, papery cover. There may be more than one sac in the web at a time.
A single female may produce up to 17 sacs, containing over 3760 eggs, in her lifetime. The sacs are usually in the center of the web but may be found in warmer or cooler sites. The eggs hatch in about 7-10 days, but the first generation of spiderlings to hatch remain in the sac until they molt once. The second generation of spiderlings to hatch then emerge and balloon.
Female spiders molt seven times and males six or seven times to reach maturity. Once fully grown, adults may live for a year or more. Since these spiders can live for relatively long periods and spawn in large numbers, pest control services are often needed to get rid of them.
Behavior of House Spiders
The house spider randomly selects its web sites. But if a web does not yield prey, another site is selected, and a new web built. Eventually, successful webs are built where air currents bring in a reliable supply of prey to feed on. Because of a greater supply of prey and generally higher humidity, house spiders do the best outdoors. Conversely, survival rates among house spiders are low in modern homes due to low humidity and a lack of insects. However, survival rates are higher in garages, sheds, barns, warehouses, and other less regulated locations.
Inside structures, house spiders are most likely to be found in upper corners, under furniture, in closets, angles of window frames, basements, garages, and crawl spaces. In warehouses, they are common in corners near doors that stay open. Outside, they are often around windows and under eaves especially near light sources which attract prey.
How to Get Rid of House Spiders
Because of their web site selection by trial and error, many webs may be constructed in several days. Dust collecting on these webs accentuates their presence. This situation is unacceptable in most households, not to mention offices and other working environments.
If you have a house spider infestation that you urgently need removed, Eastside Exterminators can help. Our pest control operators use the latest spider control methods to clear them and keep them out of people’s homes. To schedule our services, call us at 425-482-2100 today.