Contact and residual pesticides. Spiders, of one species or another, are quite common around most households. They are only distantly related to insects. Insects have six legs and three body parts, whereas spiders have eight legs, two body parts, and lack wings. Spiders are predators of insects and other spiders, and in this manner can be considered beneficial around the house.
Spiders feed on the body fluids of their prey.
Most people object to spiders because they believe their presence indicates an untidy house. It should be realized that they perform a beneficial job by catching numerous insects. Many house spiders are harmless and spin loose webs in corners and under porch eaves to catch bothersome flies and mosquitos. The tarantula is the most feared of all spiders but is generally harmless. Brightly colored garden spiders, although fearful looking, spin intricate webs between plants to catch harmful pests.