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40.005 Mompha divisella Herrich-Schaeffer, [1854]
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swollen stem

Food Plant: Epilobium montanum (Broad-leaved Wllowherb), E.palustre (Marsh Willowherb), E.lanceolatum (Spear-leaved Willowherb), E.hirsutum (Great Hairy Willowherb), E.parviflorum (Lesser-hairy Willowherb), E.tetragonum (Square-stalked Willowherb)

Mine: July-August

Notes: Makes a gall in the stem, generally near a leaf base. In Epilobium montanum (Broad-leaved Wllowherb) the galls are pea sized and may occur and occupy several leaf nodes. The stems are redder in this plant and much branched above the gall. In E.palustre (Marsh Willowherb) the galls cause a check on growth and shortening of the internode distance which leads to a mass of leaves and flowers at the plant apex, with side shoots much elongated as a result, raising them above the flower head. Pupation occurs in a white cocoon, with silk protruding out of the exit hole. The photo shows the stem galls, which redden slighly, on E.parviflorum (Lesser-hairy Willowherb). Widespread but local in England and Wales. Found in damp woodland, open areas, shaded areas and waste ground.

Data: 17.vii.2015, Plympton, Devon, VC3.

Image:© Bob Heckford

References:
Koster S & Sinev S (2003), The Microlepidoptera of Europe, 5, Momphidae s.l.
Emmet AM & Langmaid JR (2002), The MOths and Butterflies of Great Britain and Ireland, 4(1)
Langmaid JR, Palmer SM & Young MR (2018), A Field Guide to the Smaller Moths of Great Britain and Ireland

sponsored by Colin Plant Associates (UK) LLP/Consultant Entomologists

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