Cinara pinea

(Mordvilko, 1895)

Large Pine Aphid

Cinara pinea, the Large Pine , is a specialized phloem-feeding that colonizes Pinus , particularly Scots pine (Pinus sylvestris). It exhibits distinctive seasonal , with spring peaks driven by availability, followed by summer declines during drought conditions and partial autumn recoveries after rainfall. The species overwinters as laid on current-year needles, with approximately 50% egg mortality between and hatching. Winged () are produced only during June and early July, contingent on both crowding and active host shoot growth.

Ant sp. tending Cinara pinea - Flickr - S. Rae by S. Rae from Scotland, UK. Used under a CC BY 2.0 license.

Cinara pinea (Large pine aphid) - Flickr - S. Rae by S. Rae from Scotland, UK. Used under a CC BY 2.0 license.

Pronunciation

How to pronounce Cinara pinea: //saɪˈnɑːrə ˈpɪniə//

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Images

Habitat

Coniferous forests dominated by Pinus , particularly Scots pine (Pinus sylvestris). Colonizes woody stems and branches, specifically twigs bearing needles from both current and previous years. Distribution within the is influenced by phloem depth, with higher on thinner shoots where phloem is nearer the surface.

Distribution

to Europe; documented in Scotland and inferred across the range of Scots pine in Europe. Associated with Pinus sylvestris distribution.

Seasonality

Active peak in spring ( availability in phloem). produced only during June and early July. Summer population decline during drought. Partial autumn recovery following rainfall. hatch in spring; broken by increasing daylength after December 22, with hatching rate controlled by temperature.

Diet

Phloem sap of Pinus , particularly Scots pine. Feeding depends on seasonal concentrations in phloem; high spring amino acid levels support growth, while reduced nitrogen availability and increased osmotic pressure in summer limit survival.

Host Associations

Pinus sylvestris - obligatePrimary ; colonizes current and previous year shoots
Pinus - obligate-level

Life Cycle

Overwinters as on current-year needles of pine. Eggs sparsely distributed, rarely more than one or two eggs per needle. Egg mortality approximately 50% between and hatching. Hatching success increases with longer and lower temperatures; development rate after increases with temperature. Spring followed by parthenogenetic . produced in early summer under specific conditions of crowding and active host shoot growth. and egg-laying occur in autumn.

Behavior

Nymphal distribution shows 'inertial' pattern: smallest feed near at shoot tips, while () feed primarily on second-year twigs. on shoots correlates with phloem accessibility rather than gregariousness. crashes occur during summer drought; rapid response to improved water status following autumn rainfall.

Ecological Role

Produces that supports growth and attracts predatory including yellowjackets (Vespula pensylvanica). Serves as for various . Acts as a nutrient sink, extracting phloem and excreting excess as honeydew.

Human Relevance

Potential forestry pest; heavy can reduce tree growth. production creates sticky on surfaces beneath infested trees. Subject of modeling studies to understand - interactions and develop management strategies.

Similar Taxa

Cinara strobiAlso colonizes Pinus ; distinguished by preference for pine and seasonal autumn activity peak
Cinara conifer aphidsGeneral morphological similarity within ; C. pinea distinguished by specific association with Scots pine and distinctive seasonal

More Details

Population Regulation

Computer modeling indicates that nymphal is the primary for size, sensitive to both and quality as reflected in growth rates. production, contrary to conventional belief, proved negligible in regulating population numbers due to insufficient production and brief seasonal occurrence.

Alate Induction

Winged production requires both crowding during nymphal development AND tree in active shoot growth stage. Mature shoots suppress formation regardless of crowding. and temperature do not directly influence alate production; maternal crowding experience does not affect nymphal response.