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Ash Midrib Gall Midge
Dasineura fraxini
Dasineura fraxini is a gall midge which forms galls on the leaves and petioles of ash (Fraxinus species). It was first described by Johann Jacob Bremi-Wolf in 1847.
From the article Dasineura fraxini on Wikipedia (CC BY-SA), quoted section by section
Description
Most of the gall is on the underside of the main vein, where it forms a narrow green pouch. There can be several on a leaf, ranging in size from 5 mm to 30 mm, although they can coalesce. Each contains an orange larva. There is a slit-like opening on the upperside of the leaf. The galls can be found from June to October and can also be found on the petiole and rachis. It is found on Fraxinus angustifolia & subsp., F. excelsior, F. ornus and F. oxycarpa.
Inquiline The larvae of Clinodiplosis botularia are reddish-yellow, grow faster and outcompete the gall maker, which perish.
Wikipedia: “Appearance of the gall”
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Every page naming Dasineura fraxini in the Biodiversity Heritage Library →
This page is assembled live from iNaturalist, GBIF, Wikipedia, the Source Library and the Internet Archive. It is not yet part of the hand-edited codex. iNaturalist taxon 464834.