Butterflies and Moths of North America

collecting and sharing data about Lepidoptera

Carpenterworm Moth
Prionoxystus robiniae (Peck, 1818)

Family: Cossidae
Subfamily: Cossinae
Identification: Forewing in female mottled gray and blackish, slightly translucent. Forewing in male less sharply mottled. Hindwing yellow with black outer border in male; no yellow in female.
Wing Span: 4.3-8.5 cm. Female larger than male.
Life History: Larva bores into wood, and the life cycle takes 3-4 years. Larval tunnels decrease the value of hardwood lumber.
Flight: April-October, mostly June-July.
Caterpillar Hosts: Ash, chestnut, locusts, oaks, poplars, willows, and other trees.
Adult Food:
Range: Throughout eastern North America.
Management Needs:
Comments: NULL
Alternate Scientific Names:
Prionoxystus robinae