Macrosiphum

Passerini, 1860

Species Guides

25

Macrosiphum is a of aphids ( Aphididae) comprising over 160 distributed across three subgenera. These aphids exhibit a complex involving parthenogenetic during summer months and in autumn, with . The genus includes economically significant agricultural pests such as the (M. euphorbiae) and rose (M. rosae), as well as species associated with diverse plants including roses, potatoes, tomatoes, and various wild plants.

Macrosiphum gaurae by no rights reserved, uploaded by Jesse Rorabaugh. Used under a CC0 license.Macrosiphum rosae by (c) David Anderson, some rights reserved (CC BY), uploaded by David Anderson. Used under a CC-BY license.Macrosiphum albifrons by (c) Jarro Nevsbaru, some rights reserved (CC BY), uploaded by Jarro Nevsbaru. Used under a CC-BY license.

Pronunciation

How to pronounce Macrosiphum: //mæˈkroʊˌsaɪfəm//

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Habitat

within Macrosiphum occupy diverse ranging from agricultural fields and greenhouses to dry forests and natural vegetation . -alternating migrate between hosts (such as Rosa spp.) and secondary hosts including cultivated crops, while non-host-alternating populations persist year-round on secondary hosts, particularly in protected environments like greenhouses.

Distribution

The has a broad distribution with records from North America, Europe, and other regions. Specific distribution varies by : M. euphorbiae occurs across multiple continents including North America and Europe, with UK showing distinct persistence; M. ginajo is restricted to western North America; and other species show regional distributions in Europe and Asia.

Seasonality

Activity patterns vary by and type. -alternating populations exhibit spring from hosts to secondary hosts, and autumn return migration. In temperate regions, sexual morphs (males and oviparae) are produced in autumn for mating and -laying, with eggs overwintering. Parthenogenetic dominates during warmer months.

Diet

Macrosiphum are phloem-feeding sap-suckers that feed on plant vascular tissues. Specific associations vary by species: M. euphorbiae feeds on potato, tomato, lettuce, and other cultivated plants; M. rosae feeds on roses; M. ginajo feeds on glandular-sticky species of Silene (Caryophyllaceae); M. aetheocornum feeds on native Geranium species.

Host Associations

  • Rosa spp. - Primary for host-alternating of M. euphorbiae
  • Solanum tuberosum - secondary Potato, major agricultural for M. euphorbiae
  • Lycopersicon esculentum - secondary Tomato, for M. euphorbiae
  • Lactuca sativa - secondary Lettuce, for M. euphorbiae
  • Silene spp. - Caryophyllaceae, for M. ginajo in dry forest
  • Geranium spp. - for M. aetheocornum

Life Cycle

The includes multiple morphological forms: fundatrix (founding stem mother), viviparae (wingless parthenogenetic females), viviparae (winged parthenogenetic females), oviparae (sexual -laying females), and males. Summer consist of parthenogenetic females producing live young. In autumn, sexual morphs are produced; males and females mate, and females deposit eggs. Some populations, particularly in greenhouse or mild climate settings, persist asexually year-round without the sexual phase.

Behavior

-alternating engage in migratory in spring and autumn. Spring transports aphids from hosts to secondary hosts; autumn migration returns them to primary hosts. morphs disperse to new host plants. Populations can build rapidly under favorable conditions through parthenogenetic .

Ecological Role

As phloem-feeding herbivores, Macrosiphum function as agricultural pests causing direct damage through sap removal and indirect damage as of plant . They serve as prey for diverse natural enemies including (e.g., Aphidius ervi, Aphidius colemani), lady beetles, larvae, and syrphid fly larvae. Some exhibit resistance to parasitoid attack, influencing .

Human Relevance

Multiple are significant agricultural pests. M. euphorbiae () damages potato, tomato, and other crops through direct feeding and transmission of insect-vectored . M. rosae (rose ) is a pest of ornamental roses. Management approaches include using reared , applications (though resistance has been documented), and breeding. The is studied for its complex reproductive and chromosomal inheritance patterns.

Similar Taxa

  • MetopeurumBoth belong to tribe Macrosiphini and share general ; distinguished by taxonomic classification and associations
  • AphisBoth are with similar feeding habits and agricultural pest status; Macrosiphum typically have longer and different cornicle proportions
  • MyzusBoth are with -alternating and agricultural significance; distinguished by morphological details of , cornicles, and cauda

Sources and further reading