Lucerne flea

Definition

A common name for Sminthurus viridis, a globular springtail (Collembola: Sminthuridae) that is a significant agricultural pest of legume crops, particularly lucerne (alfalfa), clover, and pasture grasses in Australia, New Zealand, Europe, and parts of North America. Despite its name, it is not a true flea (Siphonaptera) but rather a hexapod in the subphylum Hexapoda, distinguished by its furcula (springing organ) used for escape locomotion. Adults feed on leaf surfaces, causing characteristic pitting and silvering damage that reduces forage quality and yield.

Etymology

From 'lucerne,' the British term for alfalfa (Medicago sativa), the primary host crop, plus 'flea,' referring to the species' small size and jumping ability, though it is taxonomically unrelated to true fleas.

Example

In Australian pasture systems, lucerne flea outbreaks often coincide with cool, moist conditions in autumn and spring, with dense populations capable of defoliating entire lucerne stands; management relies on selective insecticides or resistant cultivars, as the springtail's cuticle is relatively impermeable to many standard formulations.

Synonyms

• clover springtail
• lucerne earth flea

Related Terms

• Collembola
• springtail
• Sminthurus viridis
• globular springtail
• Furcula
• alfalfa pest
• pasture pest

Usage Notes

The name 'flea' is misleading and should be avoided in precise taxonomic contexts; 'lucerne springtail' would be more accurate. In agricultural literature, the term is primarily used in Australia and New Zealand; North American sources more often use 'clover springtail.' Not to be confused with the lucerne flea beetle (Longitarsus spp., Chrysomelidae), a coleopteran pest with similar host associations but distinct morphology and management.