Variegated cutworm

Definition

A polyphagous caterpillar, the larval stage of the noctuid moth Peridroma saucia, characterized by variable dorsal patterning that ranges from pale brown to nearly black with pale dorsal markings. The species is a significant agricultural pest across temperate and subtropical regions, with larvae feeding on foliage, stems, and fruits of numerous crops including lettuce, tomato, and grape. Adults are known as the pearly underwing moth, recognized by the iridescent hindwing coloration visible in flight.

Etymology

From Latin variegatus (variegated, many-colored) + cutworm, referring to the larva's habit of cutting seedlings at the soil surface.

Example

In Pacific Northwest vegetable production, variegated cutworm populations often surge during mild winters, with larvae clipping emerging onion seedlings and climbing vines to feed on developing pea pods.

Synonyms

• pearly underwing (adult stage)

Related Terms

• Cutworm
• Noctuidae
• polyphagy
• agricultural pest
• larval migration
• Peridroma saucia

Usage Notes

Refers specifically to the larval stage; adult moths are called pearly underwings. Distinguished from other cutworms by the irregular, mottled dorsal pattern and the presence of a dark W-shaped mark on the fourth abdominal segment. The species exhibits facultative migration, with northern populations annually recolonized from southern overwintering areas.