Control: Periodically check areas in and around the home where black widows may occur. When discovered they can be most effectively destroyed by crushing or vacuuming the web and spiders. Spiders also can be discouraged by increased lighting of darkened corners, such as by appropriate furniture arrangement or use of artificial lighting. Insecticides can be useful for spider control but do not control all spiders. If you choose to apply an insecticide, do so to the dark, undisturbed areas where spiders are likely to produce webs. From http://generalx.com/bwtxt.html''
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Poison is temporary, has to be maintained, and ...bad for you.
I dont know of any spider traps...
Living in an environment where 'widows don't normally live...
keeping your house sealed tight - no leaks...
get rid of the widows' source of food
what do they eat??
mostly other insects - afaik. Google is your friend.