Leaf-miner: Egg either at upperside or underside of the leaf. The mine begins
as a narrow cooridor, often following a vein or the leaf margin.
Later sections of the corridor are mch wider and contorted, mostly
forming a secondary blotch. Frass in a narrow central line, sometimes
a bit broader towards then end of the mine. Often several mines
a a leaf (Bladmineerders van Europa).
Initially the long slender gallery, with a thin central frass line, may follow the leaf edge. It then widens suddenly and twists to form a blotch-like mine. The frass is still in a thin central line with clear margins to the gallery. The mine may be confused with S.malella but with this species the larva is yellow whereas with desperatella it is green. There may be several mines in a leaf. Vacated mines cannot be identiufied with certainty (British
Larva: The larvae of moths have a head capsule and chewing mouthparts with opposable mandibles (see video of a gracillarid larva feeding), six thoracic legs and abdominal legs (see examples).The larva is green; this distinguishes the species from malella,
that also lives on apple, but has a green larva.
magadelenae may be
found on apple, and this species has green larvae. The only reliable
difference is that the larva of magadelenae has a field of fine spinules on abdomen 9, that is lacking in desperatella (Emmet, 1983a; Gustafsson and van Nieukerken, 1990a) (Bladmineerders van Europa).
Pupa: The pupae of moths have visible head appendages, wings and legs which lie in sheaths (see examples).
The adult is not illustrated in UKMoths (check for update). The genitalia are not illustrated by the Lepidoptera
Dissection Group (check for update).
Hosts in Great Britain & Ireland:
of year - larvae: Currently unknown.
of year - adults: Currently unknown.
in Great Britain & Ireland: Britain (Karsholt and van Nieukerken in Fauna Europaea). See also British
leafminers distribution map.
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Distribution elsewhere: Widespread in continental Europe including Austria, Bosnia and
Herzegovina, Bulgaria, Croatia, Czech Republic, Estonia, French
mainland, Germany, Hungary, Italian mainland, Lithuania, Republic
of Moldova, Poland, Romania, Slovakia, Slovenia, Switzerland and
Ukraine (Karsholt and van Nieukerken in Fauna Europaea).
NBN Interactive Grid Maps of known host species:
British and Irish Parasitoids in Britain and elsewhere: