How to Get Rid of Brown Recluse Spiders

Q: have found 2 brown recluse in my basement (I have a teenage son down there)Is Deltamethrin the best product to use? Are there any other recommendations?

A: The first and foremost step you want to take is to thoroughly clean your basement. You need to clear out as much clutter as possible to eliminate possible shelter for the brown recluses. If you have any leaky pipes or anything that may act as a source of moisture, it needs to be removed and cleaned up as well. In terms of pesticides, LambdaStar 9.7% CS  is a great product to use on brown recluses and its active ingredient is Deltamethrin. We recommend using the Suspend SC with several glue traps for the most coverage.

Suspend SC - 1 PintLambdaStar 9.7% CS


brown-recluse-spider-pest-control22HOW to GET RID of BROWN RECLUSE SPIDER – POSIONOUS SPIDERS

A Brown Recluse Spiders reclusive characteristic is that they seek hiding places and shelter. They are very adaptable and will still be active in temperatures from 45F to 110F, meaning that they will still be active during the winter. Brown recluse spiders have soft bodies with yellowish-tan to dark brown color. They can vary from 1/3- 1/2″ in length and can be over 1″ in diameter including the legs. They can be identified by a dark brown violin looking shape mark (please refer to the picture for identification). The brown recluse spider spins a web that is white to gray in color. They are active at night and usually eat other insects as in cockroaches and other small insects. Brown recluse spiders can survive up to 6 months without food or water.


Brown recluse spiders can be found usually in indoors, bathrooms, bedrooms, closets, garages, basements and cellars. They can also be found living in or around the duck work or registers on above-ceiling duct works. Brown recluse spiders can be found outside in storage houses or buildings where things are stored and they MAY also be found in sheltered corners with debris, wood piles, and under loose stones. They can make webs under furniture, appliances and carpets, behind baseboards and door facings, even in corners and crevices.


People usually get bitten when they change clothes or when they put their hands in their pockets or even putting on their shoes. The pain from the bite will not be as intense immediately, but within 8-12 hours the pain will become intense.

  1. The person might have fever, chills, nausea, and joint pain.
  2. The person might become restless within 24-36 hours after they have been bitten
  3. The area of the bite will swell because the tissue will become inflames and it would be hard to touch. The venom of the brown recluse spider has an enzyme that will destroy cell membranes in the bitten area.
  4. After a few days, a huge ulcerous sore will form. If the wound is open from the bite, it may range from the size of an adults thumbnail to the size of the hand. The sore heals extremely slowly; it will take about 6-8 weeks to heal and it will leave a large, disfiguring scar. If possible, you would need to take the brown recluse spider to the doctor to get identification immediately.
  5. The person should apply an ice pack to relieve the swelling.

The brown recluse spiders only bite when someone or something disturbs their spot as a defense mechanism, so if you find a spider, please do not touch it with bare hands or feet.


If you live in the area where brown recluse spiders are common, you will need to shake out your clothing and shoes be dressing just in case a brown recluse spider is hiding in them. You will need to inspect any items that you are going to use and you will have to WEAR GLOVES the whole time when you are going to garden, handle firewood and pine straws. You should not go outside barefooted because the brown recluse spider might bite your foot or you might step on one. You should also eliminate much clutter as you can in the storage areas and also vacuum and dust around the windows, corners, and under furniture often.

Crack and Crevice Treatments:
This treatment is generally applied with a liquid spray (LambdaStar 9.7% CSFenvaStar EcoCap ) and dust (DELTA DUST), and aerosols ( CY-KICK AEROSOL, ALPINE AEROSOL) to be applied to small cracks and crevices in a structure with spiders may live and hide.

For liquid spray application, you will need to have a pressure sprayer or a gallon sprayer (CHAPIN 1 GALLON SPRAYER). For (LambdaStar 9.7% CSFenvaStar EcoCap ) you will need a low pressure system with a pinpoint or variable pattern nozzle to apply the spray mixture to areas such as floors, cracks and crevices, in and around baseboards, walls, expansion joints, around your windows, and under your furniture. You will need to apply using the amount that is said on the label and may need to reapply if needed.

The dust application is simple. However, when using dust please be cautious especially when children and pets are present. Use dust only in areas where it is hard for them to reach. The DELTA DUST, you will need to use a BELLOW BULB DUSTER . When using a BELLOW BULB DUSTER for DELTA DUST, you will need to fill the duster with the dust as directed in the label and apply DELTA DUST to cracks, spaces or bearing joints between the wooden members of the structure. Apply lightly and uniformly to the infested area. DO NOT OVER USE DUST. The aerosols are used by spraying into the crack and crevice.

Since aerosols and liquid sprays are liquid be cautious if you are spraying near any electric equipment or outlet.

Directly getting rid of the web that the spider has made already you will need to use COBWEB ELIMINATOR. You will directly spray the COBWEB ELIMINATOR on the web and it makes it easier to remove the web without leaving any of it behind. It also discourages the reformation of webs. The COBWEB ELIMINATOR has a mildly acidic odor to it, but it is indicating that the product is effectively working.

LambdaStar 9.7% CS -1 pt FenvaStar EcoCap-(Generic Onslaught) - 8 oz.
LambdaStar 9.7% CS FenvaStar EcoCap

These products can be used with this item:

Chapin 1 gallon Sprayer
Delta Dust

These products can be used with these items:

Bellow Bulb Duster

Broadcast Treatments:
This treatment is generally used for large turf or other land

Alpine CY-Kick

scape areas and will contain directions for specific amounts of the product to be applied as a liquid spray (LambdaStar 9.7% CS) to a given area.

Broadcast treatments are usually for the entire lawn. For this treatment we suggest a 1 gallon sprayer for the application of liquid spray (CHAPIN 1 GALLON SPRAYER). Following the directions on the label, you would spray the entire lawn with the solution. Spray areas where there are lots of trees and bushes in the backyard making sure you have gotten every inch of the lawn where the spider might live.

LambdaStar 9.7% CS -1 pt FenvaStar EcoCap
LambdaStar 9.7% CS FenvaStar EcoCap

These products can be used with this item:

Chapin 1 gallon Sprayer

Barrier Treatments:
This treatment is applying a liquid spray to zone around on a structure that any pest might enter the zone. These are sometimes called a perimeter treatment where soil areas are adjacent to a structure as well as a portion of the lower foundation wall next to the soil are treated (LambdaStar 9.7% CS).

Barrier treatments or Perimeter treatments are used just around the structure of your home to create a barrier for you home. We suggest that you use a gallon sprayer as well (CHAPIN 1 GALLON SPRAYER). Using the directions of the amount and the rate that you should use, apply a continual band of insecticide around a building foundation and around windows, doors, service lines entrances, eaves, vents, and other areas can greatly reduce the potential for entry by pests. Also apply a band to the soil 6-10 ft. wide around and adjacent to the building and treat the building foundation to a height of 2-3 ft. where peats are active and may find entrance. Apply as a coarse spray treatment to thoroughly and uniformly wet the band. For better results, this treatment needs to be done regularly to reduce the amount of insects and to keep your house insect free.

LambdaStar FenvaStar EcoCap
LambdaStar 9.7% CS FenvaStar EcoCap

These products can be used with this item:

Chapin 1 gallon Sprayer

Date: Thursday, 14. January 2010 9:43
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  1. 1

    I just moved to Kansas in a brand new apartment and I keep finding spiders. Im assuming they’ve been having a grand time in the apartment before i got here, because i waited two months after it was built to move in. Part of the problem is the poor insulation under the doors — just now I (luckily) caught a spider walking into my home. I don’t know specifically what kind of spiders I’m dealing with (you’d be crazy if you think I would get close up to them), but any suggestions (specifically treatments, sprays, bombs, NUKES, whatever you would suggest would be wonderful.

  2. 2

    Hi Ali,

    I do recommend contacting maintenance to not only start a pest control program for your apartment, but to also get the insulation fixed under the doors so that you can eliminate one of the main entry points. Indoors, you can always use an instant knockdown spray like Cy-Kick or 565 Plus XLO to kill the spiders on sight. If you have any further questions or comments, please feel free to contact us again.

  3. 3

    I live in Missouri and have lived in my house for 19 years, during this time I have never seen a brown recluse in my house. Over the last 24 hours I have killed two brown recluse spiders in my room. My room is usually cluttered, which I know I should fix that, but the only thing that has changed is that I bought a mini fridge at a garage sale. Could a brown recluse web be in the bottom or in the back of the mini fridge? I cleaned out the inside so I can only imagine it might be in the open back of it. I’m definitely buying sticky traps in the morning. If the spiders came from the fridge how fast could they spread throughout my home?

  4. 4

    Its very possible and likely that they could be coming from the back of the fridge. Using glue boards is a great idea. You will have to use a lot of glue boards for larger coverage area. The spiders may forage around for food, but will likely come back to its nesting area.

  5. 5


  6. 6

    Brown recluse do reside in areas of South Florida. Glue boards are one of the best ways to eradicate brown recluse problems. For indoors you can use a product called Zenprox EC, which is labeled specifically for brown recluse and indoor use. Once it has fully dried it is safe for the children or pets to reoccupy the area. Focus spraying around crack and crevices. These are likely areas in which they will reside because brown recluse spiders like secluded and undisturbed areas.

  7. 7

    This may sound insane but my neighbor saw and killed what she swears was a brown recluse walking on the water in my swimming pool. She said she also saw one in the skimmer box sitting atop a pool toy. Is that even possible? Would they be able to live in let alone walk across the water? Now I’m terrified to let my kids swim and I can’t find any information on recluses and water. Can you help please and thank you.

  8. 8

    Brown Recluse spiders don’t usually live in the water. Fishing spiders would actually be ones to likely infest the pool area. With out a picture its difficult to give you an exact answer of what the spider may be. However treating the perimeter of the pool area with a residual insecticide like Suspend SC will help control the insect population in that area which would also be the spiders food source.

  9. 9

    Hello! My renovation home has a brown recluse infestation. It has 4 fireplaces in it and they’re also living in the fireplaces. I have plans to have the home proprely treated, but I’m not sure what I can do to to get them out of the chimneys, does anyone have any advice?

  10. 10

    I would suggest that you light you fireplace so that all the bugs will by the smoke. However it is the middle of summertime, so it may not be the most appropriate approach during this time of year… Your other options would be to use glue boards to capture the brown recluse.

  11. 11

    Hello i just found a large spider with orange skinny legs. I saw it crawl have out of my shoe then back into it. I through the shoe outside and lost it. I live in Wisconsin what else could this be i cant sleep at all

  12. 12

    Hi Jr,

    Thanks for your post. It doesn’t sound like brown recluse spiders because they are shades of brown. However it does sound like it could have been a woodlouse spider.

  13. 13

    Which of these treatments for brown recluse are safe if you have small pets in the house?

  14. 14

    For Brown Recluse treatment we would recommend either Taurus or Zenprox EC. Zenprox EC is designed for indoor use only. The Taurus can be used both indoors and outdoors but the active ingredient contains a slight odor so you will need to thoroughly ventilate the air after application. Once product has fully dried, the area can be reoccupied. For Brown Recluse treatment it is necessary to treat undisturbed areas, cracks, and crevices.

  15. 15

    Hello yesterday I found a brown recluse crawling on my newborns bassinet, I killed it but what are the chances their are more around shuld I be worrieafter seeing one? will their bites kill a baby?, I live in a desert area in California.

  16. 16

    The recluse you saw crawling around was most likely a random forager foraging for food. Brown recluse spiders prefer to reside in undisturbed areas and are not likely to nest out in the open or near areas where frequent disturbances may occur. The male recluse spiders spend most of their days foraging around for food which appears to have been the case for your situation. The best way to get the recluse spiders to leave your area is to eliminate their food source which would be other insects that may be living in the area.

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