Casemaking Clothes Moth

The casemaking clothes moth, Tinea pellionella (Linnaeus), is a significant pest of natural fibers, belonging to the family Tineidae. Adults are small, shiny grayish-brown moths, 6-9 mm in wingspan, with three faint dark spots on each forewing (often indistinct). Their head is covered with reddish hairs. Females lay 30-200 small, white eggs singly on host materials. The larvae, up to 12 mm long, are creamy white with a dark head. They uniquely construct a silken case, incorporating fibers from their food source, which they carry as they feed. Larval development is highly variable, taking 35 days to 2.5 years, depending on temperature, humidity, and food availability. Pupation occurs within the larval case.

Adult casemaking clothes moths are weak fliers, often observed crawling or making short, erratic flights. They are negatively phototactic, preferring dark, undisturbed areas. Females actively seek out suitable materials for oviposition. The larvae are the damaging stage, consuming keratinous materials. They never leave their silken case, enlarging it as they grow, and retreating fully inside when disturbed. Larvae may drag their case across surfaces, leaving behind silken trails. Pupation also occurs within the case, often attached to a surface.