If you live in a warm, humid climate, you have likely spotted them out of the corner of your eye: tiny, gray, diamond-shaped pods stuck vertically to your baseboards, garage walls, or hanging underneath the couch. They look like a stray bit of lint or a pumpkin seed covered in dust.
But if you watch one closely for a few minutes, you might see a tiny, dark head poke out of the bottom and drag the entire structure slowly up the wall.
Meet the plaster bagworm (Phereoeca uterella), also commonly known as the household casebearer. While they do not bite, sting, or carry diseases, they are accomplished indoor architects that can secretly wreak havoc on your wardrobe, carpets, and cobwebs.
The Secret Life of a Living Lint Ball
The creature you see crawling up your wall is not actually a worm; it is the larval stage of a small, nondescript gray moth.
What makes the plaster bagworm fascinating—and incredibly annoying—is its camouflage. The moment the larva hatches, it spins a silk sleeping bag around itself. To make the bag tough and hidden from predators, the larva weaves in local debris collected from your home: plaster fragments, dust, sand grains, human hair, pet dander, and bits of old spiderwebs.
The case is perfectly symmetrical and open at both ends. This design allows the caterpillar to poke its head out of one side to feed, flip around inside the case if it hits a dead end, and poke its head out of the opposite side to walk away.
What Do Plaster Bagworms Eat?
Plaster bagworms do not eat wood like termites, nor do they feed on your kitchen pantry. Instead, they thrive on a diet of keratin and arthropod silk. Inside your home, their favorite buffets include:
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Old spiderwebs and abandoned cobwebs
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Dead insects and shed pet dander
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Natural fabrics like wool, silk, and cotton
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Upholstery, carpets, and rugs
If a bagworm hitches a ride into your closet, its feeding habits will manifest as mysterious, ragged holes in your favorite wool sweaters or silk blouses.
How to Get Rid of Plaster Bagworms
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