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Bug Blog: Spider Control

Written by Chem-Wise on . Posted in Blog

House Spiders

A common pest encountered throughout the year is the house spider (Achaeranea tepidariorum). House spiders are usually pale yellow, tan, or gray. They are ½ inch or less in length, are not hairy, and spin webs indoors. Webs are frequently abandoned in sites that do not yield prey and new webs are constructed. In fact, house spiders are often referred to as cobweb spiders because of the high number of empty webs that they leave behind.

Although there are thousands of different species of spiders, there are only 2 in North America that are dangerous to humans: the Brown Recluse and the Black Widow. Fortunately, neither of these is very common in the Chicagoland area.

You may see the following in and around your home.

  • jumping spiders
  • crab spiders
  • wolf spiders

All spiders are capable of inflicting painful bites and some people may have bad reactions.

Female house spiders produce approximately 250 eggs at a time which are placed in a silken sac in the center of the web. Under good conditions, depending on temperature and humidity, several egg sacs may be present in the web at the same time. The eggs will hatch in 7 to 10 days and the spiderlings will migrate to their new locations. They can live for 3 weeks or more without food or water. Consequently, the survival rate of the house spiders is fairly high. Spiders are actually beneficial to our environment. They are predators of most live insects and help to control mosquitoes, flies, gnats, and aphids. This plays an important role in spider control. By reducing the food source, we can reduce the number of spiders.

Since house spiders usually construct their webs in open areas of buildings, the easiest way to manage infestations is by non-chemical methods of spider pest control:

  • Regularly sweeping down webs and egg sacs
  • Caulking cracks around windows and door frames
  • Make sure window screens are properly fitted

In addition, exterior lights attract insects which will attract spiders to feed. You may want to consider replacing mercury vapor lights with sodium vapor lights, which are less attractive to insects. In any case, regular exterior perimeter treatments of spider control can drastically reduce spider infestations. Contact your local office for more information or click here.

Bug Blog: Springtime Pests

Written by Chem-Wise on . Posted in Blog

There are two pests that Chem-Wise focuses on while performing  our Spring Tri-Annual barrier treatment. Although you may experience a variety of pests; ants and spiders are the most prevalent in the spring. Pavement ants, Crazy ants, and Carpenter ants are the primary ant species that we will encounter in the Chicagoland area. The key factor in the ant surge in the spring is due to the colonies coming out of dormancy and seeking food and water. On the inside of your home the preferred method of treatment would be to inject a bait gel into the cracks and crevices in the areas that you are seeing the ant activity. This material is very low in toxicity and a very small amount of the bait is used. It is completely odorless and colorless.

Another common pest of the spring months is the spider. Although spiders are considered to be beneficial, in some circumstances they are considered to be pests. There are too many species of spiders in the Midwest that become nuisances to name them all, but the good news is that typically there are no “poisonous” species in Chicago and it’s suburbs. The key to controlling spiders is to control their food source, which happens to be insects. The best way to do so is to have a general preventative maintenance pest control program such as our Tri-Annual service program. The interior treatment for spiders will consist of a general treatment of any unfinished portions of your basement or crawlspace and the interior of the attached garage as these are the most common sources for spider activity. The exterior of your home will also be treated to create a barrier and prevent spiders and insects form from entering your home.

As you can see, an ounce of prevention is worth a pound of cure!