Smynthurodes

Westwood, 1849

Species Guides

Smynthurodes betae(Bean root aphid)

Smynthurodes is a of gall-forming aphids in the Aphididae. The genus includes at least one well-documented , Smynthurodes betae, which induces galls on plants. Gall formation in this genus appears to be constrained by host plant rather than active site selection by colonizing aphids. The genus has been recorded from parts of northern Europe.

Pronunciation

How to pronounce Smynthurodes: /smɪnˈθjʊroʊˌdiːz/

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Distribution

Recorded from Denmark (DK), Norway (NO), and Sweden (SE) based on GBIF distribution data.

Behavior

In Smynthurodes betae, gall site selection has been observed to be non-optimal. Colonizing aphids settle on leaves based on arrival timing and leaf developmental stage rather than discriminating among sites that maximize . Aphids have been observed failing to distinguish between shoots and congeneric non-host shoots on which they cannot survive.

Human Relevance

Smynthurodes betae has been reported as a pest of millets.

More Details

Taxonomic note

Catalogue of Life lists Smynthurodes as a synonym of Tychea, though this treatment is not universally accepted. GBIF and NCBI recognize Smynthurodes as a valid .

Research note

The 1993 study by Wool et al. in Ecological Entomology provided key evidence challenging the preference-performance hypothesis in gall aphids, using Smynthurodes betae as a model system.