Sharpshooters

Definition

A common name for leafhoppers in the tribe Proconiini (subfamily Cicadellinae, family Cicadellidae), characterized by large size relative to other leafhoppers, robust bodies, and enlarged heads with powerful cibarial pumps used to forcibly eject liquid excreta—hence the name. These xylem-feeding insects are significant agricultural pests and vectors of plant pathogens, including Xylella fastidiosa, the bacterium causing Pierce's disease of grapevine, citrus variegated chlorosis, and olive quick decline syndrome.

Etymology

From the forcible ejection of liquid waste ('sharpshooting') that can travel considerable distances, a conspicuous behavior when these insects feed on xylem sap.

Example

The glassy-winged sharpshooter (Homalodisca vitripennis), native to the southeastern United States, became an invasive pest in California in the 1990s, threatening the wine industry as a vector of Xylella fastidiosa.

Synonyms

• proconiine leafhoppers

Related Terms

• Leafhoppers
• Cicadellidae
• xylem feeders
• Vector
• Xylella fastidiosa
• Homalodisca
• spittlebugs

Usage Notes

In entomological contexts, 'sharpshooter' never refers to marksmanship; the term is taxonomically precise for Proconiini but is sometimes applied more loosely to large cicadelline leafhoppers generally. Distinguish from 'spittlebugs' (Cercopidae), which also produce liquid waste but form protective foam. The cibarial pump morphology is diagnostic: sharpshooters possess enlarged, strongly muscled pumps adapted to the negative pressure of xylem extraction.