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Old 10-02-2010, 02:56 PM   #1
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DIY spider killer?


I had a guy come out to spray my house a while back and most spiders do die when they touch the surface of the house. I want to make something like this myself and possibly get a sprayer similar to what he used that way I can just do the job myself.

Anyknow know what to buy/mix together to come up with a spider killer that is fairly friendly to other stuff?

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Old 10-02-2010, 04:49 PM   #2
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guaranteed no collateral damage to other species, as long as you have good aim.

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Old 10-02-2010, 04:55 PM   #3
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Haha. I usually just use my hand if the spider is not in a web, but I need something that works when I'm away. Currently duct tape seems to catch some of em too.
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Old 10-02-2010, 05:10 PM   #4
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how do you know the spiders are dying? Is this like instantaneous?
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Old 10-02-2010, 08:31 PM   #5
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I see them dead right on the walls outside sometimes. Whatever the stuff he uses is, it works great, but it also costs 200 bucks to get him out here and I'm sure I could get the same effects with the right product and I could apply as much as I want. If I can spray all the joists and walls with something that kills them, it should stop the webs which is really my main fear - very weird, but they just creep me out when I run into them. It's the way they feel and how they stick to you, and how they look. *shivers*.

There is also products designed to stop webs from being formed, does that type of stuff work at all? That may be another option, combined with just repelling spiders. I know they don't like lemon, orange and other such smells, so I could make a repellent using oranges, and it would also smell good, though I wonder if it would rot. I've smelled rotten orange juice before, and it aint a pretty smell.

I also want to look at insulating all the rim joists with foam, think that should cut down on spiders as well? Where do they normally enter by? Cracks in walls, sump pit?
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Old 10-03-2010, 07:53 AM   #6
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DIY spider killer?


These can be purchased over the counter, at least here in Pa. and are good for spiders and crawling insects.

Active ingredients:
1) Lambda-cyhalothrin (trade names: Demand, Border, other trade names at the big box stores.
2) Delatamethrin
3) Cyfluthrin
My preference is #1, the others are good second choices.
These can be bought as concentrates to be mixed with water. If you have dark siding, soffits, etc then spray a small area first, let it dry and look for cloudy, whitish, deposits. If so, keep it off those areas in the future. Can be cleaned off with water, does not set in as a stain. If it doesn't matter to you, then spray away. Read and understand the labels.

I never heard of products designed to stop webs from being formed; sounds like a good sales pitch.

Repelling spiders with citrus based chemicals sounds good, but I have no idea if it works; if it did I believe that our industry would use it. Another good sounding idea. I suspect that for citrus oils to work, they would have to be applied frequently. Hope this helps.

Last edited by PAbugman; 10-03-2010 at 07:54 AM. Reason: adding info to active ingredients.
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Old 10-03-2010, 03:03 PM   #7
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What kind of store would sell these, would I get that from a pest control place? I like the idea of buying in concentrate and just mixing myself, probably cheaper for doing large areas. If it works to the point where I can freely walk in my basement or crawlspace without worrying about running into webs, then if I have to apply it every couple months, I'll do that.
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Old 10-03-2010, 06:23 PM   #8
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There are sites that sell pest control supplies on-line. When you find them, look for Demand or Border.

If you go to the big box stores then look at the active ingredients on their labels. The box stores don't sell under the Demand/Border label but you may find the same active ingredients; that would be fine. Matching the active ingredient is more important than the brand name.

Buying as a concentrate and mixing with water will be much cheaper. AFter you familiarize yourself with the label, you will see that you have a range of concentrations that you can mix. The first time or two, use the higher rate, when you treat every 2 or 3 months after that, you can cut back to the lower rate.
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Old 10-03-2010, 07:07 PM   #9
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Cool I will do that. I do recall buying ant killer powder, and other ant killer products, I'd have to check at the store what the active ingredient is, maybe I can use that. From my research ant killer and spider killer tend to be the same things. So I just have to look for Lambda-cyhalothrin or the other two as the active ingrediant, and should be set.
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Old 10-03-2010, 07:54 PM   #10
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Hmm this stuff sounds promising, do you know anything about it?

http://www.amazon.com/Demon-Wp-Envel...6153547&sr=1-2

I would buy a pump sprayer as well.
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Old 10-04-2010, 05:55 AM   #11
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DIY spider killer?


Demon is good. It is a powder that you mix with water and it will cause staining and discoloration on dark surfaces. For spiders I still like Border or Demand (same active ingredient in both).
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Old 10-04-2010, 11:47 AM   #12
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DIY spider killer?


I can't seem to find Border or Demand anywhere, know of any places that would sell and ship to Canada? I did find Demon on ebay and it seems quite cheap too.
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Old 10-04-2010, 03:40 PM   #13
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DIY spider killer?


Did you google Demand? I find this site called Domyownpestcontrol.com that sells it. I didn't realize you were in Canada, that may make a difference. Even here in the states, not every state allows the same products to be sold there.

I've never purchased anything from the above site, don't know anyone who has, and I have no interest in that site. I don't think we're allowed to post sites here, but I'll try it. If I am in error by publishing this site, then I apologize in advance and accept the decisions of the moderators. I enjoy this site and I want no trouble.
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Old 10-04-2010, 04:22 PM   #14
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DIY spider killer?


I'm thinking it's ok as long as you're not promoting your own product but I could also be wrong.

I found the site you mentioned but they'll only ship to the states. I did find Demon WP on ebay.ca though. Oddly enough it was not on Amazon.ca and is on the .com, so maybe it's not legal here? Is this stuff or Demand or any of the others considered harmful to the environment or is it rather friendly once diluted as directed? While I want to kill spiders and create a surface they'll die on, I also don't want it to harm small animals or people. I do have chipmunks around that I'd like to remain alive and healthy.

While searching deeper for Demand I did find CYONARA 9.7 which has 9.7% Lamda-Cyhalothrin

Last edited by Red Squirrel; 10-04-2010 at 04:28 PM.
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Old 10-04-2010, 04:47 PM   #15
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DIY spider killer?


Demon wp will do fine on spiders, just be careful on dark surfaces that you care about. It wipes up with water anyway, but if it is on a porch ceiling or soffit then it can be hard work. I still like lambda-cyhalothrin better, as it is a micro-encapsulated insecticide. Long residual with minimal toxicity.

Demon and Demand are in the "low" toxicity range, as opposed to "moderate" and "high" range. The greatest risk to people and environment is when working with the concentrate. When mixed, apply the insecticide to the structure in a low-pressure and controlled application. Non-target insects will die from it, especially with an exterior application. Indoors greatly limits the type of non-target insects and reptiles that would contact it. Toads, frogs, lizards do not do well with insecticides. If the spider problem is indoors, then keep treatment inside. The exposure to humans is minimal as far as inhalation. Wet surfaces should be avoided until dry. The label will give you guidance.

The Cyonara sounds interesting; try to get that-otherwise the demon will do fine.

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