Sitotroga cerealella

Definition

A small gelechiid moth whose larvae develop inside intact cereal grains, making it a primary pest of stored and field-dried maize, wheat, rice, and sorghum worldwide. Unlike surface-feeding stored-product pests, the larva burrows into the kernel, consuming the endosperm and leaving only the empty hull and a circular exit hole; this internal feeding renders grain unmarketable even at low densities and allows the species to hitchhike undetected in international grain shipments.

Etymology

From Greek sitos (grain, food) + troge (gnawing, feeding) + Latin cerealella (diminutive of cerealis, pertaining to grain)

Example

In sub-Saharan African smallholder storage, Sitotroga cerealella often co-occurs with Sitophilus weevils; while the weevil leaves conspicuous external damage, the Angoumois grain moth's hidden infestation is detected only by the sudden appearance of adults at harvest or by the fine powder (frass) accumulating beneath stored cobs.

Synonyms

• Angoumois grain moth
• rice grain moth

Related Terms

• Gelechiidae
• stored-product entomology
• internal feeder
• primary pest
• grain protectant
• hermetic storage
• phosphine fumigation

Usage Notes

The common name "Angoumois grain moth" derives from the French province where early infestations were documented, though the species is now pantropical and subtropical. Distinguish from external-feeding moths such as Ephestia and Plodia: Sitotroga requires intact kernels for oviposition and larval development, so damage appears only after adult emergence. In quarantine contexts, larval presence in grain is often used as evidence of pre-export infestation rather than storage infestation.