Pea leafminer

Definition

A common name for Liriomyza huidobrensis, a small fly (Diptera: Agromyzidae) whose larvae feed as leaf miners inside the mesophyll of leguminous and other vegetable crops, creating serpentine or blotchy mines that reduce photosynthetic capacity and marketability of produce. Native to South America, it is now a cosmopolitan pest of greenhouse and field agriculture, with broad host range including pea, spinach, lettuce, potato, and numerous ornamental species. Adults puncture leaves to feed on sap and lay eggs; larval mining and adult stippling together cause the primary damage. The species is frequently intercepted in quarantine and is subject to phytosanitary regulation due to its rapid development, insecticide resistance, and capacity to vector plant pathogens.

Etymology

From "pea," the crop with which it was first prominently associated, plus "leafminer," describing the larval habit of feeding within leaf tissue.

Example

In coastal California spinach fields, pea leafminer outbreaks during late spring can render entire harvests unmarketable when larval mines coalesce across leaf surfaces, prompting growers to deploy banker plants of non-crop hosts to conserve parasitoid wasps in the genus Diglyphus that attack the larvae.

Synonyms

• Liriomyza huidobrensis
• serpentine leafminer
• South American leafminer

Related Terms

• leaf miner
• Agromyzidae
• Liriomyza
• Integrated Pest Management
• Parasitoid
• quarantine pest
• polyphagy

Usage Notes

The common name "pea leafminer" is sometimes applied loosely to other Liriomyza species, particularly L. langei in western North America, which is morphologically similar and shares hosts; accurate identification requires examination of male genitalia or molecular markers. In international agricultural literature, the scientific name is preferred to avoid ambiguity. The species is often referenced in invasion biology and resistance management contexts due to its history of rapid range expansion and documented resistance to multiple insecticide classes including pyrethroids, abamectin, and spinosad.