Pseudaletia unipuncta

Definition

A noctuid moth species commonly known as the true armyworm or white-speck moth, currently classified under Mythimna unipuncta (Haworth, 1809). The species is a significant agricultural pest whose larvae—called armyworms—feed in dense, mobile aggregations on grasses and cereal crops including corn, wheat, and rice. Native to the Neotropics but now widespread across North America, South America, Europe, Africa, and Asia.

Etymology

From Greek pseud- (false) + Aletia, a related noctuid genus; unipuncta Latin for 'one-spotted,' referring to the single forewing spot.

Example

Larvae of Pseudaletia unipuncta moving en masse across a cornfield can defoliate plants overnight, giving rise to the common name 'armyworm' for their regimented, marching behavior.

Synonyms

• Mythimna unipuncta
• true armyworm moth
• white-speck moth
• common armyworm
• rice armyworm

Related Terms

• Mythimna
• Noctuidae
• Armyworm
• Lepidoptera
• agricultural pest
• larval aggregation

Usage Notes

Pseudaletia unipuncta is a junior synonym; current taxonomy places this species in Mythimna. The name persists in older literature and some regional agricultural extension materials. Subspecies names (e.g., P. u. quechua, P. u. tseki) appear in historical sources but are rarely used in modern treatments.