The larvae feed on Sagina nodosa. They create a trivalved tubular silken case of 4.4-5.8 mm with a mouth angle of 35-45°. The case has a few indistinct length lines and the surface is roughened by sand grains of varying size that are spun into it and fragments of the epidermis of mined leaves. The larvae mine the leaves, but also feed on the fruit. Full-grown larvae can be found in August and September.
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