Last modified: April 20, 2020, 11:06 a.m.
A common species throughout Belgium.
The caterpillar is light green with a light brown head capsule.
At first a rather long serpentine mine at the underside of the leaf, most of the time parallel with the main vein, but later on turning to the leaf margin where it is widened into a small whitish blotch. The caterpillar in this blotch starts eating the parenchyma and spins the mine into a tentiform shape which after a while turns brownish. Later instars leave the mine and spin a tip of the leaf downwards. The last instar spins the leaf downwards into a leaf roll.
See also gracillariidae.net and bladmineerders.be.
A semi-transparent cocoon at the underside of a leaf.
Mines can be found from May till early October. The pupal skin protrudes from the cocoon, after the emergence of the adult. The adults hibernate and can be observed feeding on the catkins of Salix trees in early spring.
There is usually only one long generation per year of which the moths can be found from September, hibernating, till May of the next year. However, some fresh specimens have been found in May–June, supposing the occurrence of a partly second generation.
The larvae feed oligophagous on several species of Populus and Salix, rarely also on Myrica gale.