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Heliozela sericiella (Haworth, 1828)

An uncommon species in Belgium.

The larva lives on Quercus. The mine starts in the petiole, or bark or twig and ends with an excision very close to the leaf-base of the leaf. The oval case is portable and the larva descending in it to the ground where it's attached to detritus. Pupation in the case. 

The adults fly in one generation a year; during May and early June. The adults can be seen flying in numbers round the lower branches of the food plant and surrounding undergrowth.

Belgium, Oost-Vlaanderen, Vlinderhoute, 06 September 2009.
mine and oval excision on Quercus (Photo © Steve Wullaert)
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Comments to Willy De Prins or Chris Steeman
© Flemish Entomological Society