06/04/2026
Bug of the Week! This week’s bug of the week is the larder beetle, Dermestes lardarius. I’ve done a bug of the week on the larder beetle before, so I’ll be brief in describing it, but most of us have seen one. They are a smaller beetle, about ¼ in length. Their head and pronotum are brown, and they have dark brown elytra broken by a light tan band. Dermestids are notable because these beetles are hairy. The larvae, like the adults, are hairy as well, and resemble an elongate lint ball. We find these beetles in many, if not most homes, and the beetles are adapted to living off our refuse. Specifically food stuffs with proteins and fats and our shed skin. So, anyone with pets or kids where food bits may hit the floor probably has them.
There are many species of dermestid beetle. Some are specialized in feeding on the rotting flesh of carcasses, but those are different species. I mention this beetle now as one of our retired farm employees mentioned how he picked up a bag of sunflower seeds at a local grocer and found the beetles there. If you think about it, this isn’t surprising as many stores with food likely have food bits hitting the floor providing fodder for the beetles. It also exposes one of the many ways the beetles get moved around or introduced into our home. Sometimes we wonder where bugs come from and it’s almost always from us, often an overlooked avenue we never thought of. But it’s not worth calling a pest company for this species. A good cleaning usually takes care of the problem or keeps the indoor populations so low we rarely see them. And we could even think they are doing us some good, eating all those shed skin bits we don’t even notice we drop.
Joey Slowik, IPM Technician
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The photograph is from https://en.wikipedia.org/wiki/Dermestes_lardarius