Spotted cucumber beetle

Definition

A species of leaf beetle in the genus Diabrotica, native to North America, known for its yellow-green elytra marked with twelve black spots. The species is a significant agricultural pest in both larval and adult stages: larvae (southern corn rootworms) feed on roots of seedlings and cucurbits, while adults skeletonize leaves, damage flowers and fruits, and vector bacterial wilt (Erwinia tracheiphila) and mosaic viruses among cucurbit crops.

Etymology

Common name refers to the spotted elytral pattern and primary association with cucumber and cucurbit host plants; specific epithet undecimpunctata (Latin: undecim 'eleven' + punctata 'spotted') refers to the eleven spots on each elytron plus the scutellar spot.

Example

In integrated pest management programs, spotted cucumber beetle populations are monitored using yellow sticky traps baited with cucurbitacin lures, with economic thresholds triggering targeted neonicotinoid applications at crop emergence to prevent larval root damage.

Synonyms

• Southern corn rootworm
• Diabrotica undecimpunctata

Related Terms

• cucumber beetle
• Western corn rootworm
• bacterial wilt
• Diabrotica
• Chrysomelidae
• rootworm
• cucurbitacin
• Integrated Pest Management

Usage Notes

The common name 'spotted cucumber beetle' is sometimes applied loosely to other Diabrotica species with spotted patterns, but properly refers only to D. undecimpunctata. Contrast with striped cucumber beetle (Acalymma vittatum), which has similar biology but distinct elytral stripes and vectors the same wilt pathogen. The larval name 'southern corn rootworm' reflects geographic distribution and host range overlap with corn; larvae are not exclusive to corn. In western North America, D. undecimpunctata howardi (western spotted cucumber beetle) is sometimes treated as a subspecies or distinct species complex.