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15.020 Dialectica imperialella (Zeller,1847)
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the two mines are towards the top of the leaf, on the right and left hand side

Food Plant: Symphytum officiniale (Common comfrey), Pulmonaria officinalis (Lungwort)

Egg: underside, near to the rib

Mine: August-September

Notes: Formerly Acrocercops imperialella. A very rare miner in the UK, found in damp woodland and fens. Known from four fenland sites in the UK in Cambridgeshire, Huntingdonshire and recently (Barton, 2018) in Suffolk. The initial gallery is soon absorbed into a blotch. The blotch is squarish as the larva eats through the leaf parenchyma to the upper epidermis. The blotch turns brown and care must be taken to distinguish these mines from diptera - which can form blackish blotches. Pupation can occur inside or on the leaf surface - this was the case with on S.officinale and P sempervivens.whereas with E. plantagineum pupation took place inside the leaf (Carina van Steenwinkel pers.comm.)

National Status: pRDB1

Bradley No: 311

Data: 26.vi.2005, Amsterdam, Netherlands

Image:© Willem Ellis

Barton (2018), Dialectica imperialella (Zeller, 1847) (Lep.: Gracillariidae) in VC28; new to Suffolk. Ent Rec J Var, 130, p24-28

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