Commophila aeneana (Hübner, 1799)

the orange conch

on Jacobaea

Senecio jacobaea

Senecio jacobaea, Belgium, prov. Namur, Ave-et-Auffe, 21.iii.2018 © Ruben Meert: habitat

Commophila aeneana: larvae in Senecio jacobaea

larva in dead stem

Commophila aeneana: pupa in Senecio jacobaea

stump of a broken stem, with a pupa, covered by silk.

Commophila aeneana: flight opening in Senecio jacobaea

stump with flight opening

Commophila aeneana: pupa in Senecio jacobaea

stump with exuvium

parasite

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.

host plants

Asteraceae, monophagous

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

(PESI, 2018).

references

Amsel (1961a), Hancock & Bland (2015a), Kuchlein, Gielis, Huisman ao (1988a).

mod 29.ix.2018