Unknown a-vulgaris-stem-swelling
The inducer of this gall is unknown or undescribed.
Hosts: Artemisia vulgaris
Detachable: integral
Color: brown, gray
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Location: stem
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Our ID Notes may contain important tips necessary for distinguishing this gall from similar galls and/or important information about the taxonomic status of this gall inducer.
Gallformers ID Notes
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Tapered stem swellings observed on Artemisia vulgaris. Mordellid beetles were reared from these galls but originally believed to be inquilines. However, work by Carol Mapes and her colleagues has conclusively demonstrated that this beetle is in fact the inducer of the gall. The article will be updated when the specific name and publication info associated with that work are published.
See listing on BugGuide here. Old galls have been observed in New York, New Jersey (2) (3), Pennsylvania, and Maryland.
Larvae of Mordellistena beetles have been found in these galls and reared to adults. See paper by Abrahamson et al concerning similar inquilinism on galls of Eurosta solidaginis.
”- Gallformers Contributors: (2024) Gallformers ID Notes©
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Unless noted otherwise in the ID Notes, observations of this gall are collected in the Observation Field Gallformers Code with value a-vulgaris-stem-swelling on iNaturalist. You can view them here:
