Last modified: April 22, 2020, 10:21 a.m.
This is a rare and very local, but possibly overlooked species, mainly known from the Scheldt and Durme valleys in Flandres.
The larvae feed from April to early July in the stem and later in the roots of the host plant. Infected flowering stems often wilt at the top and droop. When feeding on Petasites hybridus, larvae of Clepsis spectrana can also cause wilting of flowering stems, so the larva should be checked in any case. The adults come to light in very small numbers.
The adults are on the wing in August and early September, always in the immediate surroundings of the foodplant.
It feeds on Petasites hybridus.