Erythroneura

Fitch, 1851

leafhoppers, microleafhoppers, grape leafhoppers

Species Guides

45

is a large of leafhoppers (Cicadellidae: Typhlocybinae) containing approximately 79 recognized . Members are small, often colorful insects commonly known as microleafhoppers or grape leafhoppers. Several species are significant agricultural pests, particularly of grapevines (Vitis spp.), while others feed on sycamore (Platanus) and various other plants. The genus exhibits complex ecological relationships including resource partitioning among sympatric species and serves as host for specialized in the Mymaridae.

Erythroneura elegantula by (c) Trevor Van Loon, some rights reserved (CC BY), uploaded by Trevor Van Loon. Used under a CC-BY license.Erythroneura anfracta by (c) Even Dankowicz, some rights reserved (CC BY), uploaded by Even Dankowicz. Used under a CC-BY license.Erythroneura bistrata by no rights reserved, uploaded by Jesse Rorabaugh. Used under a CC0 license.

Pronunciation

How to pronounce Erythroneura: //ɛˌrɪθroʊˈnʊərə//

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Identification

Identification to requires examination of male genitalia and wing venation patterns. species can be distinguished from other Typhlocybinae by the combination of small size, color patterns, and specific wing venation characters. Sympatric species on shared (e.g., multiple Erythroneura on sycamore) are often requiring detailed morphological analysis. Separation from related such as Erasmoneura and Eratoneura relies on genitalic and wing structure differences.

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Habitat

Found in diverse including vineyards, orchards, deciduous forests, and urban areas with plants. -specific host associations determine local distribution: grape-feeding species in vineyards and wild grape thickets; sycamore-feeding species in riparian areas and floodplains with Platanus; other species associated with various woody and herbaceous plants.

Distribution

Primarily Nearctic distribution with highest diversity in eastern and central North America. Range extends from southern Canada through the United States into Mexico. Individual show varying ranges: comes occurs in central and northeastern United States and Canada; Erythroneura elegantula in western North America; sycamore-associated species distributed across the range of Platanus occidentalis.

Seasonality

Activity patterns vary by and latitude. occurs as in leaf litter and debris. Adults become active in spring when temperatures permit. Multiple per year in warmer regions (3-4 generations in Oklahoma), fewer in northern areas (1 generation in New York). Peak typically occur late summer through early autumn.

Diet

Phloem-feeding on plant vascular tissues. and nymphs insert stylets into leaf to extract sap. Feeding causes characteristic stippling damage—small white or yellow spots where chlorophyll is removed. of honeydew supports growth. Specific host associations vary by : grapevines (Vitis spp.) for E. comes, E. elegantula, E. vitis, E. ziczac; sycamore (Platanus occidentalis) for E. lawsoni, E. bella, E. arta, E. hymettana, E. ingrata, E. morgani, E. torella, E. usitata; other hosts include various trees, shrubs, and herbaceous plants.

Host Associations

  • Vitis - primary Multiple including cultivated grapes and wild grape species. Only known oviposition site for E. comes despite feeding on many plants.
  • Platanus occidentalis - primary American sycamore guild of eight (maculata group)
  • Gossypium - E. pallidifrons studied on cotton in glasshouse conditions
  • Various woody and herbaceous plants - feeding E. comes feeds extensively on plants, weeds, and grasses before colonizing grape; oviposition restricted to grape

Life Cycle

Hemimetabolous development with , nymph, and stages. Eggs inserted into leaf tissue, often near . Nymphs pass through five instars, feeding on same as adults. Development time temperature-dependent; nymphal development to adult approximately 3 weeks under laboratory conditions. Continuous rearing possible on isolated leaves in Petri dishes with agar substrate.

Behavior

activity with strong positive . and nymphs typically found on undersides of leaves. Strong jumping ability using hind legs when disturbed. occurs by and jumping. Mating occurs on plants. Oviposition -specific: E. comes oviposits only in grape leaves despite feeding on diverse plants. Sympatric species exhibit fine- microhabitat segregation by leaf surface (upper vs. lower), leaf age (young vs. old), and position to reduce competition.

Ecological Role

Herbivore; phloem feeder that can reach high densities causing significant plant damage. Potential for plant including viruses, though specific vector competence varies by . Prey for diverse natural enemies including spiders, predatory insects, and . for specialized parasitoids (Mymaridae: Anagrus species) that regulate populations. Honeydew production supports fungi and attracts ants. Member of complex leaf-feeding guilds on shared hosts where resource partitioning and competition shape structure.

Human Relevance

Several are economically important vineyard pests. Eastern grape leafhopper (E. comes) and western grape leafhopper (E. elegantula) cause direct damage through feeding and indirect damage via honeydew and of fruit. Management relies on including by Anagrus , cultural practices, and targeted applications. Some species serve as research models for studying insect , competition, and coexistence mechanisms.

Similar Taxa

  • ErasmoneuraSimilar size, coloration, and associations; distinguished by male genitalia and wing venation characters
  • EratoneuraFormerly included in ; separated based on genitalic and wing structure differences
  • EmpoascaSimilar leafhopper and feeding damage; distinguished by and wing shape, coloration patterns
  • GraphocephalaSharpshooters in same ; larger size, different shape, and more robust build distinguish them from

More Details

Research significance

has served as a model system for studying ecological competition and coexistence. Research on sycamore-feeding guilds demonstrated that segregation and resource partitioning allow multiple congeneric species to coexist despite severe competition for limited food resources. Studies by McClure and others showed that eight sympatric species achieve coexistence through fine- differences in latitudinal distribution, local distribution patterns, and microhabitat use within the shared tree .

Taxonomic complexity

The contains numerous , particularly in the maculata group associated with sycamore, that are morphologically similar and require detailed examination for accurate identification. Molecular and morphological studies continue to clarify boundaries and relationships within the genus.

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Sources and further reading