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Dennis M; Hazelhurst, GA asks:  I live in an old house with a two foot high crawl space under it. The crawl space is infested with spiders. I tried those bug bombs, but they didn't help. What else can I do?

Dear Dennis: If the insect foggers didn't work it means the aerosol pesticide didn't touch the spider. An insect fogger will kill the spider if it the insecticides reach where the spider is hiding. You need to carefully read the label of the aerosol bomb. Make sure it lists spiders as one of the insects it is meant to control. If spiders are not on the label, you're using the wrong product. Most home and garden stores like Home Depot or Lowes carry the products. You can find them at grocery stores like Kroger's, too.

Second, read the label to see the cubic footage the "bomb" is meant to cover. If you're trying to treat 4,000 cubic feet, but the label says it's meant to cover 3,000 cubic feet, you're going to be 1,000 cubic feet short of your goal.


Remember, when figuring cubic feet you need to multiply the width times the length times the height of the area to be treated.

Foggers do best when set standing straight up or propped up at an angle not to exceed 45 degrees. With only two feet of height in the crawl space the aerosol spray won't be able to float all the way to the back of the crawl space. The spiders are running from the pesticides and are hiding in the back corners.

A  pest control professional would use a fogger machine that would properly fill the space with aerosol or with a pesticide dust or both. You may want to consider calling for help.

Ask Rick A Question


01 Jul 2009, 00:49
I have a problem with spiders inside my car. Could I use a bomb in my little scion?
Thanks for your help.
12 Mar 2010, 16:26
Hell yeah! Bomb the scion with two bombs, one on the center console, one under the car. However, i would cover all vinyl and leather surfaces with cloths, and i would leave the car on the acc. position so you can set the fan to recirculate low. Also doing it inside your garage would be good because it will hopefully chase buggies out of there too.
21 Aug 2011, 08:04
My husband is going to set off a Hot Shot No-Mess Fogger (all that Home Depot had) in our spider-filled garage before he starts rearranging everything. The garage is reached from the house through a door in the rec room. The rec room is where my aquariums are. We are locking and taping the door. Is there any chance of that stuff being tracked in from the garage or seeping through the wall (the wall between the two is waterproofed) or chimney?
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22 Aug 2011, 14:09
Foggers work best on flying insects. The spiders will simply move to more secure hiding places as soon as they get a whiff of the pesticide. Elimination of clutter is your best spider defense.
27 Aug 2011, 19:10
Can you use a fogger in just a bathroom? There are so many gnats in my bathroom and I don't know where they are coming from. They seem to die pretty fast. They're all over my tub, shower and floor. Only the bathroom seems to be a problem.
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28 Aug 2011, 09:15
The pesticide fogger will knock down the adult flies, but it won't solve the problem. Please read the article at this link:
09 Oct 2011, 11:55
I have bird mites and need to fog the entire house. I wanted to us Hot shot bedgub and flea fogger in my garage. Will it hurt my paint on my car. The car does not run so it must stay in garage.
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10 Oct 2011, 10:41
Cover the car with a tarp before using the fogger.
16 Feb 2012, 09:16
I killed two mice inside my house and have had something biting me for 3 months. Think it is the mites from the mice but no exterminator in my area deals with this type of thing and treat me as if I am delusional. Have used Ortho Home defense but not getting rid of them. What else can I do. I am willing to get rid of stuff as they were in a chest of drawers what do they like to hide in, have lots of books. I boil my clothes to get rid of them, haveen cased mattress, need some direction. Also have them in my car really bad, what do I fog with and hnow.
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21 Feb 2012, 11:17
If you cannot produce an insect specimen you will have no luck trying to work with a pest control company.
06 May 2012, 18:04
Hey, I was considering bombing my crawlspace to rid it of spiders (they're everywhere!). I rent, and the house is small, but I hate fighting them off every time I head under there for some wiring changes (cable, etc.). I also think it will help keep them out of the house itself. My main concern though is will the fogger leak into the house and potentially hurt my dogs? I have two large size dogs and don't want the fogger to poison them. They like to lick things and it wouldn't be beneath them to lick the floor every once in a while, in true dog-like fashion. Will the fogger harm my pups? I bought it from Kroger and it's rated for spiders.
17 Jul 2012, 15:10
Jordan - That is exactly my question. Did you figure out what to do? Thanks. K
17 Jul 2012, 15:21
There are these really tiny bugs on my window sill and sometimes in my bathroom sink. They are really tiny. About the size of a tip of a needle. What are they and is there a way to get rid of them? My bed is right next to my window. Should I move my bed?
29 Apr 2013, 14:16
We have a modular home with no basement. My husband said their are tons of spider eggs under the house and we do see spiders in the house more than I would like. Could we use a fogger or a bomb? I was thinking of setting one off under the house and one in the house at the same time as I am worried if we just do one under the house, they will all come inside. Is that a good plan? Also, will the fogger or bomb even harm spider eggs?
Thank you.
09 Sep 2013, 00:32
Want to fog under crawl space for spiders in modular home. Will poison come into the house and will bugs try to escape into the home thru my a/c vents? Should I turn off a/c and close all my vents?
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27 Sep 2013, 10:23
The poison aerosol will seep into your living space. The spiders will attempt to move away from the fogger, but any chemical that contacts them should result in death for the spider. You should set off the "bombs", but leave the house for a couple of hours. Open windows and air out the house upon your return.
05 Oct 2013, 01:10
Something is biting me inside my car. I have red mosquito like bumps all over my body. Each drive produces more bites. I cant see what it is. Most recently purchased car, used, with leather interior and nice wood grain. CanI use a bug fogger in my car to get rid of whatever it is? Fleas maybe? Previous owner may have had a pet.
Sherrie Brock
02 Jan 2014, 23:17
I think my car has mites, anyway now I have been bitten throughout my arms and back. they itch so bad. I have put clear fingernail polish on them. What can I do for my house car and SELF !! please help !!!
Thank you, Sherrie
19 Jun 2014, 02:20
We saw a wolf spider in our house last night and killed it but what can we use to make sure we don't have anymore in our house?
26 Jul 2014, 20:31
What effects does bug bomb have on paper book, comic books, poster etc. my husband is a collector and is worried the chemicals will cause a reaction of some sort and damage the quality.
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27 Jul 2014, 09:00
The bombs often contain pyrethroids and pyrethrins which are formulated with oils or petroleum distillates. These oils could damage paper.
Nicholas Knighten
30 Aug 2014, 06:39
Hey what's up? So recently, I bought a car from someone that has been sitting up under a tree at their house. So far, I have seen two spiders. I'm pretty sure that there's more. I want to GET RID of them. Any Suggestions?
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30 Aug 2014, 08:55
Use glue boards to trap the spiders. Certainly, don't use a fogger inside the car. You'll live with the smell of pesticides forever.
11 Sep 2014, 11:38
Hello ,
I have a car in my garage along with random things like my gas cans ,lawn mower, gas grill , fridge , exc can I smoke bomb (fogger )the 1 car garage with out an explosion or do I have to remove the car and all the other stuff it would kind if defeat the whole idea
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11 Sep 2014, 15:55
Foggers are mainly used for controlling flying insects. If it's crawling insects you are trying to control, you're using the wrong method. If you insist on using foggers you'll need to move your car out of the garage.
17 Sep 2014, 11:39
Hi, you suggested a few days ago that using a fogger in a cluttered garage is "the wrong method" for dealing with crawling insects (which makes sense). What's the right method? I need to move a LOT of boxes and junk around or out of my garage, and I'd prefer to lower the spider population BEFORE I start that project. Can anything be done? Or do I just move slow and keep a can of Raid with me?
30 Sep 2014, 12:33
How do I get black widows out of my car?
17 Oct 2014, 10:44
Monique I have black widows in the car, too. This is an old car that does not run. What do I do?

Looks like foggers are not the way to go but then what?

18 Oct 2014, 03:05
Hi I used a spider fogger in my 2 bedroom house and basement I used 6 cans and now I'm trying to figure out how dangerous is it I have two kids I cleaned up and whiped down everything but I'm still worried can my kids get sick of that? Help please thank you
Ask the Exterminator
18 Oct 2014, 07:39
That is a lot of material. You need to read the label. The product has a phone number that puts you in contact with the manufacturer. Call it to get your answer.
07 Nov 2014, 18:32
I recently found a black widow in my 2bedroom/1bathroom duplex home. I am worried due to my having 2 small children. Would you recommend hiring someone to spray or could I use a fogger? My concern with the fogger is the black widow/spiders might not be affected by the fogger along with having two small children who put EVERYTHING in their mouth. What would you recommend?
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07 Nov 2014, 21:31
Fogging won't do much. Put out lots of flat glue board along baseboards. You might be able to capture it as it moves around.
13 Mar 2015, 18:49
I have a large storage unit full of cardboard boxes. Unfortunately, I found a few brown and black widow spiders, along with some babies. I use a good fogger for spiders (has a black widow on the box), and I use about 4 to 6 cans to cover the area of about 15 x 30 x about 10 ft high. Will this method kill them and the babies, if not kill their food source so they at least leave?
Ask the Exterminator
14 Mar 2015, 10:16
Trying to kill spiders with foggers is futile. They run from the fumes and they can shut down their breathing apparatus to escape the effects of the bombs. Rather, eliminate their hiding spaces by reducing clutter.
14 May 2015, 01:29
Hi what could i use to get rid of roaches in my car and how long do you think it would take?
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