Helicoverpa zea

Definition

A highly polyphagous moth species (Lepidoptera: Noctuidae) whose larvae are among the most economically damaging agricultural pests in North America. The species feeds on reproductive structures of diverse crops including corn, cotton, tomato, sorghum, and legumes, earning region- and host-specific common names such as corn earworm, cotton bollworm, and tomato fruitworm. Native to the New World, it has expanded its range through human-mediated dispersal and is now established in parts of the Old World where it hybridizes with the related Old World bollworm Helicoverpa armigera.

Etymology

Helicoverpa from Greek helix (spiral, coil) + Latin verpa (spike, rod), referring to the coiled aedeagus of male genitalia; zea from Greek zeia (one-seeded wheat, spelt), alluding to its association with grain crops.

Example

Helicoverpa zea larvae tunnel into corn ears, feeding on kernels and leaving frass-filled galleries that render the ear unmarketable and provide entry points for secondary fungal pathogens.

Synonyms

• Corn earworm
• cotton bollworm
• tomato fruitworm
• sorghum headworm
• vetchworm

Related Terms

• Helicoverpa armigera
• Noctuidae
• polyphagy
• host race
• Integrated Pest Management
• Bt resistance
• larval feeding damage

Usage Notes

The proliferation of common names reflects both regional agricultural importance and the species' broad host range; specialists increasingly prefer the scientific name to avoid confusion. Helicoverpa zea is frequently confused with or hybridizes with H. armigera where their ranges overlap, complicating identification and management. The species serves as a model organism for studies of insecticide resistance evolution, host-plant adaptation, and baculovirus pathology.