uncommon species in Belgium, but as with many others probably overlooked.
larva feeds by eating the seeds of young seedpods of Melilotus.
When the seedpod is empty it serve as a case and attaches it securely
with silk to a second pod. When the second pod is empty, the two in
tandem are attached to a third pod. So a number of seedpods are
attacked in this manner. It overwinters fully fed in the case at ground
level in ground detritus.
adults fly in one generation a year during June and July. The adults
are active during sunshine and can been seen running rapidly up and
down the stems of its food plant. Later they comes to light.
Namur, Maizeret, 12 August 2010.
young case on Melilotus
confirmed by G. Baldizzone
(Photo © Jean-Yves Baugnée)