Last modified: April 23, 2019, 12:44 p.m.
A very rare species in Belgium.
The egg is laid on the upperside of Agrimonia or Aremonia.
Initially the larva makes a slender strongly contorted gallery with interrupted linear frass leaving distinct clear margins, later the gallery broadens and finally ends in a irregular blotch which often absorbs the earlier gallery. Often several mines on the same leaf.
See also bladmineerders.be
The pale violet to blackish cocoon is spun inside the mine. Therefor it is very visible when holding the leaf against the light.
The adults fly in one generation a year during June.
In Belgium Ectoedemia agrimoniae feeds on Agrimonia. In southeast Europe also on Aremonia agrimonoides.