Aster leafhopper

Definition

A small leafhopper species, Macrosteles quadrilineatus (Cicadellidae), native to North America and the principal vector of aster yellows phytoplasma, a plant pathogen that causes yellowing, stunting, and witches'-broom distortion in Asteraceae crops including lettuce, carrot, and celery, as well as numerous ornamental and weed hosts.

Etymology

From the association with Asteraceae host plants and the disease 'aster yellows' it transmits; also called six-spotted leafhopper for thoracic markings.

Example

In the Great Lakes region, aster leafhopper populations migrate northward on spring storm systems, delivering infective phytoplasma to early-planted lettuce fields before economic thresholds for insecticide application are reached.

Synonyms

• six-spotted leafhopper
• Macrosteles quadrilineatus

Related Terms

• leafhopper
• Aster yellows
• phytoplasma
• Vector
• Macrosteles
• Cicadellidae
• plant disease ecology

Usage Notes

The common name refers specifically to M. quadrilineatus, though 'aster leafhopper' occasionally appears in extension literature for related Macrosteles species with similar host associations; specialists prefer the scientific name when discussing vector competency or population genetics. The species overwinters in southern states and migrates annually, making it a predictable seasonal pest in northern vegetable production regions.