Bookworm (insect)

common name for any insect which bores through books

Bookworm is a term for any kind of insect which supposedly chews through books.

The Bookworm is a painting done by Carl Spitzweg around 1850
Pages riddled with bookworm damage
Larva of a book louse
Adult book louse

This behaviour is uncommon. Both the larvae of the deathwatch beatle (Xestobium rufovillosum) and the common furniture beetle (Anobium punctatum) will go through wood and if paper is nearby they will pass into that.

A major book-feeding insect is the booklouse (or book louse). It is a tiny (under 1 mm), soft-bodied wingless psocoptera (usually Trogium pulsatorium). The insect actually eats molds and other plants found in books that were not kept clean and safe, but they will also attack bindings and other parts. It is also not a true louse.

Many other insects, like the silverfish (Lepisma saccharina) or cockroach (various Blattodea), will eat these molds, including rotten paper or the starch-based binding pastes – warmth and moisture or high humidity are needed, so damage is more common in the tropics. Modern glues and paper are less attractive to insects.

By the twentieth century, modern bookbinding materials prevented much of the damage done to books by book-boring insects.[1]

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  1. Murray, Stuart (2009). The Library: An Illustrated History. New York, NY: Skyhorse Publishing. p. 198.