The next day, pour enough rubbing alcohol in the container to submerge the frozen spider to insure that it will not recover from being frozen. Isopropyl alcohol works on contact against aphids, spider mites, mealybugs and scale insects. Answer Save. Alright I caught a spider under a jar poured rubbing alcohol from the top thinking this would surely kill him. The now dead spider and alcohol can then be poured into the toilet and flushed away. I'm pretty bug phobic. 6 years ago. (Image: Close-up of a Brown Recluse via Shutterstock) Related Topics: Zoology. Any substance that may be harmful to humans may have a similar effect on spiders and insects in general. Rubbing alcohol , like any alcohol for any creature, is poisonous in high dosages, and it evaporates quickly doing little damage to the plant it's been sprayed on. The now dead spider and alcohol can then be poured into the toilet and flushed away. Rubbing alcohol: The rubbing alcohol you have around the house also can kill spider mites. Definitely, it does. I don't what to do and I only have Rubbing Alcohol and Powder here in my room. Another major risk is the fact that the smell of these alcohols repel bed bugs. Does saltwater kill spiders? Does Windex Kill spiders? So if you have to kill the spider, do it kindly and gently—in the freezer. Yes, it kills the spider because salt is naturally toxic to spiders. 6. Mixing with water results in a solution, which you can use to spray at the webs to directly kill the insects or destroy their nests. Also asked, does rubbing alcohol kill spider mite eggs? Arthropods have nervous systems made of neurons, much like we humans have. He is now in my jar soaking in rubbing alcohol in a concealed container. This means the ones you fail to kill will spread to other locations throughout the house to get away from the smell, resulting in an even worse bed bug infestation. It has been suggested that spraying plants with a 1:1 mixture of alcohol and water will kill spider mites on contact. I'm just wondering, will rubbing alcohol kill spiders? There was a brown recluse in the bathtub so I decided to try pouring rubbing alcohol on it, it ran around like crazy for a few seconds then stopped and started getting woozy and curled up into a ball. The outer surface, or cuticle, of these creatures is coated with a water-repelling lipid or wax layer that protects them from dehydration while keeping out unwanted material. Does Rubbing Alcohol Repel Bed Bugs? More from Smithsonian.com: Relevance. There a BIG SPIDER outside my room and I can't go to the bathroom since I have a Arachnophobia. Don't get me wrong I don't hate spiders, but I just want to kill them from a distance. The type of alcohol is very important: you need to preserve the spider without drying it out to make sure it becomes a good part of your bug collection. 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