Commophila aeneana (Hübner, 1799)
the orange conch
Senecio jacobaea, Belgium, prov. Namur, Ave-et-Auffe, 21.iii.2018 © Ruben Meert: habitat
larva in dead stem
stump of a broken stem, with a pupa, covered by silk.
stump with flight opening
stump with exuvium
From September till winter the larva bores in the rootstock. When winter approaches the larve tunnels upwards in the stem till about 8 cm above ground level. Here the wall of the stem is partially gnawed through, and the top of the gallery is closed with spinning. In the course of the winter the weakened stem mostly breaks off. In May pupation takes place in the stump.
Jacobaea paludosa, vulgaris.
In the literature also Picris hieracioides is mentioned as a host plant. However, that species both taxonomically and ecologically stands rather far from ragwort.
distribution within Europe
Amsel (1961a), Hancock & Bland (2015a), Kuchlein, Gielis, Huisman ao (1988a).