Which domesticated moth produces most commercial silk?

Bombyx mori is the domesticated moth that produces most commercial silk.

Bombyx mori is commonly called the domestic silk moth or silkworm moth. Humans have bred it for thousands of years, and its caterpillars produce silk from glands near the mouth. The continuous filament is spun to form a cocoon, which can be processed into silk thread.

The species depends heavily on people and is unable to survive well in the wild. Its principal food is the leaves of the white mulberry, Morus alba. Selective breeding has enlarged the silk-producing caterpillar and reduced traits useful for flight and predator avoidance.

A single cocoon contains a long filament, but commercial silk production usually interrupts the pupa before the adult emerges and cuts the thread. Wild silk moths also produce silk, yet Bombyx mori dominates sericulture because its cocoon quality, feeding habits, and breeding history suit large-scale production.