Northern corn rootworm

Definition

A species of skeletonizing leaf beetle (Diabrotica barberi, family Chrysomelidae) native to North America, whose larvae feed on corn roots and whose adults feed on corn silks, leaves, and pollen. A major agricultural pest of maize, it exhibits facultative diapause and can undergo extended egg dormancy, complicating crop rotation strategies. Closely related to the western corn rootworm (Diabrotica virgifera virgifera) and part of a species complex that includes the Mexican corn rootworm (D. virgifera zeae).

Etymology

Named for its northern distribution relative to related Diabrotica species and its larval habit of feeding on corn roots; specific epithet barberi honors entomologist Herbert Spencer Barber.

Example

In the Corn Belt, northern corn rootworm populations can persist in rotated fields through extended diapause, with eggs remaining viable in soil for multiple years before hatching when corn is replanted.

Synonyms

• Diabrotica barberi

Related Terms

• Western corn rootworm
• Diabrotica
• Chrysomelidae
• rootworm
• extended diapause
• crop rotation
• Integrated Pest Management
• skeletonizing beetle

Usage Notes

Distinguished from western corn rootworm by geographic range (more northerly), slightly smaller size, and different patterns of host plant use and diapause behavior. The term "rootworm" properly refers to the larval stage; adults are often called "corn rootworm beetles" in agricultural contexts. Populations in the eastern Corn Belt have shown increasing resistance to crop rotation due to extended diapause traits.