The caterpillars are about six millimeters long at the end of March. They have a glossy black head and black mouthparts, prothoracal shield and thoracic legs. The body is yellow, with a broad reddish back.
The larvae feed on Tussilago and sometimes also Petasites. They mine the leaves of their host plant. The mine consists of a small, transparent, irregularly shaped full depth mine. There are often several mines in a single leaf. The frass is granular. There is little or it is missing completely. After some time the larvae leave the mines and continue feeding freely at the leaf underside or under a folded leaf margin.
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