Several insects eat paper, but the most common culprits are silverfish, termites, booklice, certain beetle larvae, and cockroaches. Each species feeds on paper for slightly different reasons and leaves behind different evidence, so identifying which bug you’re dealing with matters for choosing the right response. The good news is that nearly all of these pests share a vulnerability: they need moisture, and controlling humidity is the single most effective way to keep them away from your books, documents, and cardboard boxes.
Silverfish and Firebrats
Silverfish are probably the first bug people picture when they think of paper damage. These small, wingless insects have a distinctive teardrop shape, silvery scales, and quick, darting movements. Firebrats are close relatives that look similar but prefer warmer spots. Both belong to the insect order Zygentoma, and they are genuinely capable of digesting cellulose, the main structural material in paper. Research on the digestive system of Zygentoma has identified both insect-produced enzymes and bacterial enzymes working together to break down plant cell walls, which helps explain why silverfish can thrive on a diet of paper, wallpaper paste, book bindings, and cardboard.1PubMed Central. The digestive system in Zygentoma as an insect model for high cellulase activity
Silverfish are nocturnal, so you rarely see them during the day unless you move a box or pull a book off a shelf and surprise one. They favor cool, damp spaces: basements, bathrooms, closets, and storage areas. Firebrats, by contrast, like heat and are more often found near furnaces, water heaters, or in attics during summer. Both leave irregular, shallow feeding marks on paper surfaces, often with a scraped or etched appearance rather than clean holes. They also eat starch-based glues, sizing on paper, and even photographs, so old books with traditional bindings are particularly attractive to them.
Termites
Termites are far better known for eating wood, but they will consume any cellulose-based material, and that includes paper, cardboard, and books. A global review of termite activity notes that termites are structural pests that damage not only wooden structures and household furniture but also books and museum collections.2Entomological Science. Economic and ecological importance of termites: A global review Unlike silverfish, termites don’t just nibble the surface. Subterranean termites can hollow out entire stacks of paper or cardboard from the inside, often without any visible damage on the outside until the material is picked up and falls apart.
If termites are eating your paper goods, you almost certainly have a broader termite problem in or around the building. They arrive through mud tubes connecting their underground colony to your structure, and paper stored in contact with the ground or near walls is especially vulnerable. The damage is typically more severe and faster than what silverfish produce. Termite damage to paper often looks tunneled, with channels running through multiple pages or layers of cardboard, and you may spot tiny mud deposits or frass (termite droppings) near the affected materials.
Booklice
Booklice, also called psocids, are among the most commonly misidentified paper pests. They are extremely small, usually one to two millimeters long, and pale or translucent. Despite their name, they’re not actually lice and they don’t bite people. What they eat is primarily the mold and mildew that grows on damp paper, paste, and book bindings. In doing so, they damage the paper surface and can degrade documents over time, especially in humid archives or poorly ventilated storage rooms.
Booklice are a reliable indicator of a moisture problem. If you see them on your books or papers, the real issue is usually that humidity is high enough for microscopic mold to grow on surfaces, and the booklice are feeding on that mold. Research on pest control in heritage buildings has found that dehumidification alone can control booklice populations, along with silverfish and furniture beetles.3npj Heritage Science. Regularity in distribution, and control, of pests in the hall of mental cultivation, the Forbidden City, Beijing, China So while booklice are annoying and can damage paper over the long term, they’re also a useful early warning system telling you that conditions are too damp for safe paper storage.
Beetle Larvae and “Bookworms”
The word “bookworm” isn’t a species name. It’s a catch-all term for the larvae of several beetle families that bore through books and paper. The most common offenders include furniture beetles, drugstore beetles, cigarette beetles, and certain species of spider beetles. In each case, it’s the larval stage that does the eating. Adult beetles may lay eggs in or near paper, but the fat, pale grubs are the ones chewing their way through pages.
Beetle larvae leave distinctive round or oval exit holes in paper and book covers, often a few millimeters across. You may also find fine, powdery frass (a sawdust-like residue) near the holes. These larvae don’t just eat cellulose for its own sake; many are after the starch, protein, or other organic compounds found in old adhesives, leather bindings, and sizing. Furniture beetle larvae, in particular, can damage both the wooden shelving and the books sitting on it, making them a double threat in libraries and archives.
Cockroaches
Cockroaches are generalist feeders. They’ll eat practically anything organic, and paper is no exception. They’re attracted to the starch and glue in book bindings, cardboard, wallpaper, and even the ink on printed pages. Cockroach damage tends to look irregular, with ragged edges and surface grazing rather than clean holes. They also leave behind dark, smeared droppings and a musty odor that can permanently stain paper.
Unlike silverfish or booklice, cockroaches don’t depend on high humidity to survive, though they do prefer it. They’re opportunistic and will damage paper wherever food residue, warmth, and shelter coincide. In homes, this often means kitchen cupboards where paper bags or cardboard boxes are stored, or cluttered closets with stacked magazines and newspapers. Because cockroaches carry bacteria and allergens, their presence on documents is a contamination concern beyond just the physical damage.
How to Tell Which Bug Is Responsible
The type of damage left behind is often the quickest clue. Identifying the pest helps you respond correctly, since a silverfish problem and a termite problem call for very different solutions.
- Surface scraping: Irregular, shallow marks on the paper surface, sometimes with a translucent or thinned appearance, usually point to silverfish or firebrats.
- Round exit holes: Small, clean, circular holes through pages or covers are a hallmark of beetle larvae. Fine powder near the holes confirms it.
- Internal tunneling: Channels bored through multiple layers of paper, sometimes with mud or soil deposits, suggest termites.
- Ragged nibbling: Irregular edges with dark smearing or droppings nearby indicate cockroaches.
- Surface mold removal: Paper that looks lightly abraded in damp spots, combined with the presence of tiny pale insects, is likely booklice damage.
Beyond the damage pattern, look for the insects themselves. Silverfish are fast and silvery, usually hiding during the day. Booklice are nearly microscopic and pale. Beetle larvae are grub-like, often found inside the book itself. Cockroach droppings look like dark specks or smears, and a musty smell accompanies heavy infestations. Termites may leave mud tubes on walls or shelving near damaged paper.
Other Signs You Might Have a Paper Pest Problem
Live insects are the most obvious sign, but they’re also the hardest to catch because many paper pests are nocturnal or too small to notice casually. Other warning signs include:
- Frass: Fine, powdery debris near books or paper storage. Different pests produce slightly different textures, from gritty termite pellets to flour-fine beetle dust.
- Cast skins: Silverfish and cockroaches both shed their exoskeletons as they grow. Finding tiny, papery husks near your paper storage is a reliable indicator.
- Yellow or brown staining: Silverfish leave yellowish stains on paper surfaces. Cockroach excrement produces dark brown or black spots.
- Musty or oily smell: A persistent musty odor near stored books can indicate either mold (which attracts booklice) or cockroach activity.
- Damaged bindings: If book spines are crumbling or separating and the damage isn’t just from age, insects may be eating the glue.
Sticky traps placed near bookshelves, in closets, and along baseboards are a low-tech way to identify which pests are active. Most paper-eating insects are drawn to traps placed in dark, undisturbed corners.
Why Humidity Is the Common Thread
Nearly every paper pest thrives in humid conditions. Silverfish need moisture to survive and prefer relative humidity above about 75 percent. Booklice are even more humidity-dependent since they feed on the mold that only grows in damp conditions. Beetle larvae develop faster in warm, moist environments. Termites require constant moisture contact to keep their bodies from drying out. Research on pest management in heritage buildings consistently finds that dehumidification is the most broadly effective single intervention against silverfish, booklice, and furniture beetles alike.3npj Heritage Science. Regularity in distribution, and control, of pests in the hall of mental cultivation, the Forbidden City, Beijing, China
This is practical knowledge, not just academic. If you live in a humid climate or store paper in a basement, garage, or attic, you are running a higher risk regardless of how clean the space is. Air conditioning, dehumidifiers, and good ventilation do more to protect your paper goods than any chemical treatment. The general target for safe paper storage is relative humidity below 60 percent, and ideally in the 30 to 50 percent range. At those levels, mold growth stalls, and most paper pests lose the conditions they need to breed.
Prevention Strategies That Actually Work
Controlling moisture is step one, but it’s not the only thing you can do. A practical prevention plan combines environmental controls with physical barriers and good housekeeping.
Store paper materials off the floor and away from exterior walls. Basements and crawl spaces are the worst locations for long-term paper storage because of both humidity and direct contact with soil, which invites termites. If you must store boxes in a basement, use plastic bins with tight-fitting lids rather than cardboard, and elevate them on shelving or pallets. Cardboard itself is attractive to many paper pests, so reducing the number of cardboard boxes in your home eliminates both a food source and a hiding place.
Regular cleaning matters. Dust, crumbs, and organic debris attract cockroaches and provide supplementary food for other pests. Vacuuming behind and under bookshelves, clearing clutter, and periodically inspecting stored documents all reduce risk. For valuable books or archival documents, sealed plastic bags or acid-free boxes provide a physical barrier that keeps most insects out.
For serious infestations or high-value collections, professional pest management goes further. Heritage libraries and archives often use an integrated approach that combines preventive environmental controls with targeted treatments. One documented approach at a heritage astronomy library combined COâ‚‚ fumigation for paper-based materials with specialized pest control for wood borers and termites that were threatening both the collection and the building itself.4Restaurator. International Journal for the Preservation of Library and Archival Material. Preserving the Scientific Legacy: An Integrated Pest Management Approach from a Heritage Astronomy Library COâ‚‚ fumigation works by displacing oxygen in a sealed enclosure, killing insects at all life stages without leaving chemical residues on the paper. It’s commonly used for museum and archive collections but isn’t practical for a typical household.
For home use, boric acid dust applied in cracks and crevices is effective against silverfish and cockroaches. Diatomaceous earth works similarly by damaging the waxy coating on insect exoskeletons. Essential oil-based treatments have also shown real effectiveness in laboratory settings. One study found that an essential oil from Stachys riederi demonstrated fumigant toxicity against booklice at very low concentrations.5PubMed Central. Identification of Insecticidal Constituents from the Essential Oil from the Aerial Parts Stachys riederi var. japonica Whether essential oils are practical for protecting a whole room of books is another question, but they can supplement other measures in enclosed spaces like cabinets or storage boxes.
What About Mothballs and Cedar?
Mothballs (naphthalene or paradichlorobenzene) are sometimes placed in book storage as an insect deterrent. They do repel some insects, but they also release fumes that can be harmful to people and pets, and the chemicals can react with paper over time, causing discoloration and brittleness. Most preservation experts advise against mothballs for paper storage. Cedar blocks and chips have a mild repellent effect on some moths and silverfish, but the effect fades as the wood dries out and is not strong enough to control an active infestation. Neither mothballs nor cedar addresses the underlying humidity and sanitation issues that sustain paper pest populations.
When Old Books Come with Pesticide Residues
If you collect or handle antique books, there’s an unexpected twist to the paper-pest story. For much of the 19th and 20th centuries, bookbinders and archivists deliberately treated materials with insecticidal solutions to protect against exactly the pests described above. Research examining historic bookbindings has found residues of mercury, DDT, dieldrin, lindane, pentachlorophenol, and endrin on tested materials.6npj Heritage Science. The use of ‘poisonous insecticidal solutions’ in bookbinding: coping with historic pesticide treatments in the archive These chemicals are now recognized as serious health hazards. In that study, one or more historic insecticides were detected in nearly every sample tested.
This means that handling old books, especially those from institutional collections, can expose you to toxic residues through skin contact or inhalation of dust. Some archives now label items known to contain pesticide residues and require gloves for handling. If you’re buying old books from estate sales or antique shops, there’s no easy way to know whether they were treated, but books with visible chemical staining on the covers or endpapers, or a faint chemical smell distinct from normal old-book odor, deserve caution. Washing your hands after handling old books is a simple, reasonable habit.
Paper Types That Are More or Less Vulnerable
Not all paper is equally appealing to insects. Older papers made from cotton or linen rags contain less processed cellulose and may be somewhat less attractive than modern wood-pulp paper, which is softer and more porous. However, old papers often come with starch sizing and animal-based glues that are highly attractive to silverfish, beetles, and cockroaches. Glossy coated papers, such as those used in magazines and art books, are somewhat more resistant to surface-feeding insects because the clay coating acts as a mild barrier, though termites will still tunnel through them.
Cardboard and corrugated board are among the most vulnerable materials because they’re thick, porous, hold moisture easily, and provide shelter as well as food. Newspapers degrade quickly on their own and become even more attractive to pests as they yellow and soften. Acid-free archival paper, while not immune, tends to hold up better because it resists the chemical breakdown that makes aging paper soft and mold-prone. For long-term storage of important documents, acid-free folders and boxes are worth the modest extra cost, not just for preservation from aging but because they create a less hospitable environment for pests.