Ctenocallis setosa
(Kaltenbach, 1846)
Ctenocallis setosa is a small native to Europe, in North America, and recently detected in Japan (2017–2018, 2023–2024) as the first record for Asia. It is tightly associated with Cytisus scoparius (scotch broom), a naturalized shrub. The species exhibits a with sexual morphs produced in fall for and no summer alternation.
Pronunciation
How to pronounce Ctenocallis setosa: /tɛnoʊˈkælɪs sɛˈtoʊsə/
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Habitat
Associated with naturalized stands of Cytisus scoparius (scotch broom) (Fabaceae); specific microhabitat preferences within plant not documented.
Distribution
Native to Europe (Denmark, Norway recorded); in North America (conterminous United States); first recorded in Asia from Hokkaido and Yamanashi prefectures, Japan (2017–2018 and 2023–2024 surveys).
Diet
Phloem-feeding herbivore; feeds exclusively on Cytisus scoparius (scotch broom).
Host Associations
- Cytisus scoparius (L.) Link - obligate Naturalized shrub (Fabaceae); sole documented in Japan
Life Cycle
holocyclic: maintains single year-round with . Sexual morphs (oviparae and males) produced in fall for laying ; no host alternation during summer. Both and alate viviparae present in .
Ecological Role
herbivore associated with an plant; potential participant in invasional meltdown dynamics where introduced herbivores facilitate or are facilitated by other non-native .
Human Relevance
Of concern as a newly detected in Japan; association with Cytisus scoparius suggests potential for establishment and spread in regions where the plant has naturalized.