Ask The Entomologist Question About Woodlouse Spiders

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How can I kill woodlouse spiders? I have killed 6 just today in my house and they are very small so I assume they are babies and there are more. Please help!


The woodlouse spider (Dysdera crocata) is a species of spider that preys exclusively upon woodlice (aka: pill bugs, sow bugs, roly polies, etc.).  They are usually found under logs in warm places, often close to woodlice, although they may occasionally wander indoors. They spend the day in a silken retreat and hunt at night without the use of a web.  They are not aggressive spiders but they have been known to bite humans if handled. Their bite can be painful but the venom causes no major medical problems.

There is no specific treatment for these spiders other than reducing their prey.  Woodlice are mostly found in damp areas such as under logs, stones, pine straw, mulch, leaf litter, etc.  Reduce these habitats by eliminating clutter in and around the home, reduce the amount of mulch, pine straw, or leaf litter next to the foundation of the home, and fix any moisture problems such as standing water, clogged gutters, etc.