Euphyllura

Förster, 1848

olive psyllids, olive psylla

Species Guides

1

is a of plant-feeding psyllids (Hemiptera: Liviidae) established by Arnold Förster in 1848. are primarily associated with olive (Olea europaea) and related plants in the Oleaceae. The genus is predominantly Palaearctic in distribution, with most species occurring in southern Europe and Asia, though records extend to southern Africa and western North America. Several species are economically significant pests of olive , including E. olivina, E. phillyreae, and E. straminea, which damage developing inflorescences and fruits. The genus exhibits typical with temperature-dependent and seasonal strategies.

Euphyllura olivina by no rights reserved, uploaded by Jesse Rorabaugh. Used under a CC0 license.Euphyllura olivina by (c) Christina, some rights reserved (CC BY), uploaded by Christina. Used under a CC-BY license.Zeudkrizop by Christian Pinatel de Salvator. Used under a CC BY 3.0 license.

Pronunciation

How to pronounce Euphyllura: //juːfɪlˈjʊrə//

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Members of can be distinguished from other Liviidae by their association with Oleaceae , particularly Olea and Phillyrea. Specific identification to level requires examination of genitalia and wing venation patterns. E. olivina and E. phillyreae are frequently confused but differ in their seasonal and precise host plant preferences. E. straminea and E. pakistanica can be differentiated by their bacterial endosymbiont profiles, with E. straminea showing high titres and Alphaproteobacteria dominance versus Gammaproteobacteria dominance in E. pakistanica.

Images

Habitat

Olive groves and natural stands of Oleaceae, particularly Olea europaea and Phillyrea latifolia. Nymphal stages are found on developing buds, inflorescences, and young fruits, with distribution influenced by sun exposure and bud development stage.

Distribution

Primarily Palaearctic: southern Europe (Greece, Spain, Italy, France), Mediterranean basin, Middle East, Central and South Asia. Disjunct records from southern Africa and western United States (California).

Seasonality

or monovoltine depending on and latitude. E. olivina shows two annually in spring (mid-May) and early summer (late June). E. phillyreae exhibits reproductive from June through December, with diapause termination occurring mid-December to early January and reproductive extending to February-March. Oviposition begins in late March, intensifying with bud swell.

Diet

Phloem sap from plants in Oleaceae, primarily Olea europaea (olive) and Phillyrea latifolia. Feeding occurs on developing buds, inflorescences, and young fruits.

Host Associations

  • Olea europaea - primary olive, major economic
  • Phillyrea latifolia - primary recorded for E. phillyreae
  • Arbutus - recorded for E. arbuti

Life Cycle

, five nymphal instars, and stages. Eggs are laid on swollen buds and developing inflorescences, with precise placement related to bud developmental stage. Nymphal development occurs on buds and young fruits. Temperature strongly influences development rate and ; development and are inhibited above 32°C. Some exhibit reproductive in adults during summer-autumn-winter.

Behavior

Oviposition preference is determined by bud developmental stage rather than position on twig. On olive, are concentrated on inner surfaces of middle pairs of developing leaves on swollen buds. enter reproductive during summer months, with termination requiring specific sequential temperature and cues (summer-like followed by winter-like then spring-like conditions).

Ecological Role

Herbivore and agricultural pest of olive . Serves as for including Psyllaephagus euphyllurae and P. saxaulicus (Encyrtidae), which function as agents. Bacterial endosymbionts including Carsonella (primary), Arsenophonus, and mediate nutritional supplementation and potentially reproductive manipulation.

Human Relevance

Significant economic pest of olive production in Mediterranean region, Middle East, and Central Asia. Summer of E. olivina causes substantial fruit damage and yield loss. Subject of programs incorporating , (phenolic compounds affect abundance), and based prediction models for management timing.

Similar Taxa

  • Other Liviidae genera distinguished by Oleaceae specialization; other typically associated with different host plant
  • CacopsyllaSome Cacopsylla occur on olive but differ in and seasonal ; species show more pronounced summer
  • PsyllaGeneral similar but Psylla typically on different and lack the specific bud-associated oviposition of

More Details

Endosymbiont biology

harbor characteristic bacterial dominated by Proteobacteria. Carsonella serves as primary endosymbiont for nutritional supplementation. E. straminea shows notably high titres with negative correlation to Carsonella and Arsenophonus abundance, suggesting potential competition or modulation. These endosymbionts represent potential targets for symbiont-based pest management strategies.

Climate adaptation

show distinct thermal with laying activity ceasing in summer when temperatures exceed 20°C, and complete reproductive inhibition at 32°C. This thermal sensitivity explains geographic distribution patterns and seasonal , with in warmer regions (e.g., southern Tunisia) showing modified compared to northern Mediterranean populations.

Tags

Sources and further reading