The larvae make a short upper-surface gallery following a leaf margin which widens, so that within the confined limits of some
umbelliferous leaves often forms a secondary blotch. The
frass is in two untidy rows of isolated grains. Larvae leave the leaf through a semi-circular slit in the lower
epidermis to pupate in the soil. Plant species which the fly larvae feed on include
Sison amomum. Mines and larvae can be found throughout the winter, the first generation from April to July although larvae can be found feeding through most of the year. ==Distribution==