Extension Connection: Controlling spiders around the home

It's pretty normal for spiders to wander indoors in the early fall when cooler outdoor temperatures force them to find shelter, so don't be surprised if you notice a spider or two trying to set up residence inside your house during the next few weeks.

Common spiders found indoors include funnelweb spiders, cobweb spiders, cellar spiders and sac spiders.

There are a few spiders whose bite requires medical attention, including the black widow, brown recluse and a newcomer called the Hobo spider.

A European species of funnelweb spider, known as the 'Hobo spider' (Tegenaria agrestis), is slowly spreading across western North America and was recently found in Colorado. Some reports indicate bites of this spider may produce wounds similar to that of brown recluse.

Be sure you and your family members know how to identify these poisonous spiders, and be watchful for them when working in favorable spider habitat areas such as rock or wood piles, sheds, basements, crawl spaces, garages, wells and storage buildings.

If you aren't willing to share your living space with spiders, a combination of sanitation and pesticides may be necessary to manage them. Pesticides alone, without some effort to remove or modify favorable spider habitats, will not be effective. For best control of spiders in and around your home:

• Remove rocks, wood piles, compost piles, old boards and other sheltering sites adjacent to the home.

• Eliminate migration of spiders into homes by caulking cracks and crevices around the foundation.

• Make sure all screens and doors are sealed tight.

• Keep crawl spaces free of debris and limit boxes and other potential hiding places from basements and other dark storage areas.

• Regularly vacuum or brush away spider webs.

• Eliminate other insects that spiders can prey on.

Residual insecticides can be used to control spiders when applied to corners and other sites where spiders tend to breed. Household insecticide products containing various pyrethroids (bifenthrin, cyfluthrin, permethrin, tetramethrin) are commonly available for this purpose and should be applied in accordance with the label's instructions. Total release foggers, which contain pyrethrins, probably will have little effect on spiders.

When spiders and webbing occur in nuisance numbers on the outside of buildings, they can be washed off with a forceful jet of water. Reduction of outdoor lighting or replacing lighting with yellow or sodium vapor lights that are not attractive to insects can limit spider web building.

For more information, including color photos and descriptions of Colorado spiders, refer to CSU fact sheet number 5.512 "Spiders in the Home" online at http://www.ext.colostate.edu/pubs/insect/05512.html or available at the CSU Moffat County Extension Office, 539 Barclay Street, 824-9180.

Comments

springpondbver 6 years, 6 months ago

How to kill pests without killing yourself or the earth......

There are about 50 to 60 million insect species on earth - we have named only about 1 million and there are only about 1 thousand pest species - already over 50% of these thousand pests are already resistant to our volatile, dangerous, synthetic pesticide POISONS. We accidentally lose about 25,000 to 100,000 species of insects, plants and animals every year due to "man's footprint". But, after poisoning the entire world and contaminating every living thing for over 60 years with these dangerous and ineffective pesticide POISONS we have not even controlled much less eliminated even one pest species and every year we use/misuse more and more pesticide POISONS to try to "keep up"! Even with all of this expensive pollution - we lose more and more crops and lives to these thousand pests every year.

We are losing the war against these thousand pests mainly because we insist on using only synthetic pesticide POISONS and fertilizers There has been a severe "knowledge drought" - a worldwide decline in agricultural R&D, especially in production research and safe, more effective pest control since the advent of synthetic pesticide POISONS and fertilizers. Today we are like lemmings running to the sea insisting that is the "right way". The greatest challenge facing humanity this century is the necessity for us to double our global food production with less land, less water, less nutrients, less science, frequent droughts, more and more contamination and ever-increasing pest damage.

National Poison Prevention Week, March 18-24,2007 was created to highlight the dangers of poisoning and how to prevent it. One study shows that about 70,000 children in the USA were involved in common household pesticide-related (acute) poisonings or exposures in 2004. At least two peer-reviewed studies have described associations between autism rates and pesticides (D'Amelio et al 2005; Roberts EM et al 2007 in EHP). It is estimated that 300,000 farm workers suffer acute pesticide poisoning each year in the United States - No one is checking chronic contamination. In order to try to help "stem the tide", I have just finished re-writing my IPM encyclopedia entitled: THE BEST CONTROL II, that contains over 2,800 safe and far more effective alternatives to pesticide POISONS. This latest copyrighted work is about 1,800 pages in length and is now being updated at my new website at http://www.stephentvedten.com/ .

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Stephen L. Tvedten 2530 Hayes Street Marne, Michigan 49435 1-616-677-1261 "An invasion of armies can be resisted, but not an idea whose time has come." --Victor Hugo

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