Aphis spiraecola

Patch, 1914

Spirea aphid, green citrus aphid, apple aphid

Aphis spiraecola is a described by Edith Marion in 1914. It is a significant agricultural pest of citrus, apples, and numerous ornamental plants across temperate and tropical regions worldwide. The species exhibits remarkable flexibility, colonizing over 65 across more than 20 . It reproduces primarily through across most of its range, with holocyclic producing sexual on primary hosts Spiraea and Citrus. The species has displaced Aphis pomi in some regions and is considered in many areas where it has been .

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Pronunciation

How to pronounce Aphis spiraecola: /ˈeɪfɪs ˌspɪreaɪˈkoʊlə/

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Identification

Bright greenish- to apple green body with dark and . Yellowish-green features dusky on each with membranous pale . Lacks marginal on lower abdomen—this distinguishes it from the morphologically similar Aphis pomi, which possesses these tubercles. of the mitochondrial COI gene provides reliable -level identification, particularly useful for distinguishing stages and where morphological characters are less reliable.

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Habitat

Found on young growth of woody shrubs and trees, particularly those with shrubby growth habits. Colonizes young , shoots, flowers, and leaves of plants. Primary hosts are Spiraea spp. and Citrus spp.; secondary hosts span numerous including Caprifoliaceae, Compositae, Rosaceae, Rubiaceae, and Rutaceae. Absent from cold regions; thrives in temperate to tropical climates.

Distribution

to the Far East; now globally distributed across temperate and tropical regions. Present in North America (first recorded 1907), South America, Europe (Mediterranean region from 1939, spreading northward to UK, Germany, and Scandinavia from 2000s onward), Africa (from 1960s), Asia, and Oceania (Australia from 1926, New Zealand from 1931). Not established in cold climates.

Diet

Phloem sap feeder specializing on young, succulent tissues. Feeds on young , flowers, shoots, and leaves. : documented on over 65 plant including Citrus spp., Malus spp. (apple), Pyrus spp. (pear), Prunus spp. (stone fruits), Theobroma cacao, Carica papaya, and Annona spp. Shows preference for with shrubby growth habit; citrus and apples are most economically significant .

Life Cycle

Development from newborn to female takes 6–10 days depending on temperature (6–7 days at 28–30°C, 9–10 days at 22–24°C; field development averages 8.1–8.6 days). Reproduces parthenogenetically across most of geographical range; holocyclic produce sexual with primary Spiraea and Citrus. Can theoretically produce 20+ per vegetation season on apple. Average ranges from 9.5–10.5 nymphs per female under laboratory conditions to 20.7–21.2 nymphs under field conditions; approximately 67% reach adulthood.

Behavior

Forms dense colonies on young growth. Exhibits strong potential due to polyphagy and rapid ; easily establishes in new areas through movement of fruits and ornamental plants. Survives and reproduces readily in ranges barring cold climate limitations.

Ecological Role

Major agricultural pest causing direct feeding damage to young growth and transmitting viruses. Serves as for numerous including () such as Scymnus syriacus. often insufficient for adequate . Displaces Aphis pomi in some regions through competitive superiority.

Human Relevance

Significant economic pest of citrus, apple, and ornamental industries worldwide. Causes direct yield loss through feeding damage and indirect losses through virus transmission. Subject to intensive management; imidacloprid favored for orchard control, with ethion, parathion-ethyl, dimethoate, fenitrothion, and dimefox also used. to insecticides has been documented in some (e.g., Greece). Accurate identification essential for effective management due to differential susceptibility compared to Aphis pomi.

Similar Taxa

Aphis pomiOverlapping plants and 'apple ' create frequent confusion. Distinguished morphologically by presence of marginal on lower in A. pomi (absent in A. spiraecola), and by shorter rostral in A. pomi. Molecular identification via COI barcoding or real-time recommended where morphological uncertainty exists.
Aphis gossypiiBoth are pests of agricultural ; may co-occur on some . Distinguished by host preferences and morphological details.
Toxoptera citricidaBoth are citrus-feeding ; A. citricola was synonymized with A. spiraecola, while T. citricida remains distinct. Historical taxonomic confusion resolved by Hille Ris Lambers in 1975.