Eucosma metzneriana (Treitschke, 1830)
Artemisia vulgaris, Belgium, prov. Antwerp, Mechelen, de Potpolder © Carina Van Steenwinkel; identification uncertain
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.
Asteraceae, narrowly monophagous
Artemisia absinthium, vulgaris.
Bradley, Tremewan & Smith (1979a), Buhr (1964a), Houard (1909a), Szőcs (1977a), Tokuda, Kawauchi, Kikuchi & Iwasaki (2015a), Tomasi (2014a).