Eucosma metzneriana (Treitschke, 1830)

mugwort bell

on Artemisia

cf. Eucosma metzneriana: gall on Artemisia vulgaris

Artemisia vulgaris, Belgium, prov. Antwerp, Mechelen, de Potpolder © Carina Van Steenwinkel; identification uncertain

cf. Eucosma metzneriana: larva in gall on Artemisia vulgaris

young larve in opened gall


inconspicuous fusiform swelling of the stem, recognisable because the frass is ejected as a light coloured lump. Inside a pale yellow caterpillar with a brown head. Pupation in the stem in a flimsy cocoon, close to an already prepared exit opening. The part of the plant above the gall often ultimately dies off.

host plants

Asteraceae, narrowly monophagous

Artemisia absinthium, vulgaris.


Grapholitha, Semasia, metzneriana.


Bradley, Tremewan & Smith (1979a), Buhr (1964a), Disqué (1905a), Houard (1909a), Huisman & Koster (1996a), Huisman, Koster, van Nieukerken & Ellis (2009a), Szőcs (1977a), Tokuda, Kawauchi, Kikuchi & Iwasaki (2015a), Tomasi (2014a).

mod 16.x.2019