The larvae feed on Astragalus, Coronilla, Dorycnium, Galega and Medicago sativa. They create an ochreous pistol case with many sharp ridges and a sharp ventral keel. The pallium (cloak) covers about three quarters of the case and has a pair of wing like extensions at the rear. It is strongly inflated and has a scalloped surface structure. The colour is yellowish white at first, but brown or even black later. The mouth angle is 45°. Older larvae no longer feed within fleck mines, but feed on all leaf tissue except the stronger veins. Larvae can be found from autumn to May of the following year.
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