Southern Ag Natural Pyrethrin Concentrate
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.