Murgantia histrionica

Definition

A species of shield bug (family Pentatomidae, order Hemiptera), commonly called the harlequin cabbage bug or calico bug, native to the Americas and ranging into the southern United States. Adults are strikingly patterned with black, red, orange, yellow, and white markings; nymphs lack the full adult coloration. It is a significant agricultural pest of Brassicaceae crops—particularly cabbage, kale, and mustard—and of the ornamental plant Cleome, feeding on sap and causing chlorosis, wilting, and distortion of host tissues. In tropical regions it completes three to six generations annually; in northern parts of its range it is univoltine, overwintering as adults in crop residues.

Etymology

From Latin histrionicus, 'of or pertaining to actors or the stage,' referring to the bug's theatrical, harlequin-like color pattern.

Example

In organic brassica production, Murgantia histrionica management relies on hand-removal of adults and systematic destruction of the diagnostic black-and-white striped egg clutches, typically laid in groups of twelve on leaf undersides.

Synonyms

• harlequin cabbage bug
• calico bug
• fire bug
• harlequin bug

Related Terms

• Pentatomidae
• Hemiptera
• Brassicaceae
• Univoltine
• Integrated Pest Management
• shield bug
• Crop residue

Usage Notes

The common name 'harlequin bug' is also applied to unrelated colorful insects in other regions; in entomological contexts, specify 'harlequin cabbage bug' or use the scientific name to avoid ambiguity with Dindymus species (Pyrrhocoridae) or other brightly marked true bugs. The species is sometimes treated as a model organism for studying host-plant specialization on glucosinolate-defended plants.