sac spiders

May 3, 2010 by · Comments Off on sac spiders 

Sac spiders

Sac spiders are yellow in color and build a sac like structure where they hide in the daytime. There are only two species of sac spiders in the U.S. but it is thought that they are responsible for very high percentage of spider bites inside homes. It is not known if the bites can become serious. They are about 4-10 mm in size.

            Bites are generally when the spider is disturbed in bedding or clothing but it is thought that they will also bite when unprovoked. They will be found in corners of ceilings and walls of basements and all over the house. Sac spiders are a nuisance and should be treated with insecticides when large numbers are present in homes. They will be found outdoors and indoors throughout the season

black widow spiders

April 27, 2010 by · Comments Off on black widow spiders 

Black Widow Spiders

Black Widows get the name because of the myth that females eat the male after mating. The fact is that this is very rare. Females are about ½ inch long with a red “hour glass” design on the abdomen. They are shiny black in color. Males are not a danger to humans as they do not bite. Black widows feed on other spiders and insects. Venom can be fatal but mostly in children. Widows try to avoid high traffic areas but will attack if guarding the nest or if they feel threatened. In Iowa, widows are rarely found unless brought in from other states.