In many cases, spiders are beneficial insects that will help control other insect problems like flies, mosquitoes, roaches and other pests. But spiders can become pests too, especially black widows and brown recluse spiders that can give a painful bite when disturbed. When spiders become a problem, you'll need a good spider killing spray to deal with them. Although catch and release is the best way to deal with spiders, it isn't practical in all cases, so using a spider killer may be the best solution.
Every spider killer on this list will be effective, but the best one will be the safest to use, be readily biodegradable, made with natural ingredients and it will also be the best bang for the buck deal here. As always, wear a face mask and rubber gloves when using any of these products.
Southern Ag Natural Pyrethrin Concentrate gets mixed in a spray bottle with water. The natural pyrethrin ingredient is made from chrysanthemums, and that makes it biodegradable and water soluble for a safe and environmentally best bang for the buck spider killer that there is. Read Full Review
The safest to use, the best bang for the buck, and just as effective as anything else, that's what you get with Southern Ag Natural Pyrethrin Concentrate. First of all, it's a concentrate. You mix a cap-full or two into a quart spray bottle and then add water. 8 ounces of concentrate is going to equate to about 20 quarts of mix. That is an incredible value. It's made with natural pyrethrins, which is an insecticide made from the chrysanthemum plant. It's water soluble, biodegradable, and about as safe as a spider killing insecticide can be. Pyrethrin works to disrupt the neurological function in a spider, so death is relatively quick and painless. This is the best insecticidal spider killer there is, and it's so versatile that it can be used as a generic insect control substance. Great stuff.
TERRO Spider Killer Spray is one of the most respected names in insecticides. It is made with two synthetic pyrethrins for extra effectiveness, in a residual formula that keeps on killing for up to 12 weeks. Read Full Review
From a name you know and trust, TERRO Spider Killer Spray will get the job done. It is made with two synthetic pyrethrin ingredients, which act as neurotoxins, so although not natural, it still breaks down and is relatively environmentally friendly. The carrier is a mineral oil based substance, so once sprayed, it offers a residual effect that keeps killing spiders for up to 12 weeks. It comes complete and ready to use in a can, spray it on webs or where spiders are lurking, and let the active ingredients do the rest.
Hot Shot Spider and Scorpion Killer uses a pyrethrin-based synthetic neurotoxin mixed in two types of mineral oils for outstanding residual effect. Once sprayed, it will last up to 16 weeks to kill and deter spider infestation. Read Full Review
For the longest lasting residual effect in a spray, choose Hot Shot Spider and Scorpion Killer. It is made with a synthetic pyrethrin derivative, that is mixed with two types of carrier oil substances that keep the active ingredient working for up to 16 weeks. Although this is one of the more expensive spray type of spider killers, if you have a severe spider problem and want to keep them from coming back, this may be the best alternative for that. Spray it on webs, on known spider paths, in cracks and crevices for unrivaled residual protection that can't be beat.
Spider Not Aerosol Kills Spiders uses a synthetic pyrethrin called D-Trans Allethrin that is mixed with petroleum distillates for maximum residual effect and killing power. However, if you have cats as pets, the active ingredient is highly toxic to them, so this is not a good choice around felines. Read Full Review
This may be the best spider killing spray that you've never heard of. Spider Not Aerosol Kills Spiders, true, but it is also packaged in a highly pressurized spray can that will easily reach high up on ceiling or corners where most sprays won't go. It will actually kill any spiders as the blast from the can will knock down any webs if they are present. The active ingredient is a synthetic pyrethrin named D-Trans Allethrin. Although like most synthetic pyrethrins, it is relatively safe and not very toxic to humans, this particular formula is very toxic to cats. The petroleum distillate oils it is mixed with give it a very high residual effect, and although safe and effective in most situations, if you have cats as pets, use something else.
Black Flag Spider and Scorpion Killer Aerosol Spray is the least expensive spider killing spray on this list. It's made of a synthetic pyrethrin in a mineral oil mix that will give you a residual spider killing and deterrent effect for up to 16 weeks. Read Full Review
For the best deal in a spider killing spray, get Black Flag Spider and Scorpion Killer Aerosol Spray. Made of a synthetic pyrethrin in a mineral oil mix, this spray kills as well as anything else and lasts up to 16 weeks of residual effectiveness. If we were giving a bang for the buck award for a spray can, this one takes the prize. Realistically, every other spider killing spray kills spiders just as effectively, but Black Flag costs less then any of the other spray types on this list. It is cost effective to use, lasts long and you won't go broke if you need a couple of cans for a major spider infestation.