Plant Parasites of Europe

leafminers, galls and fungi

Cochylis nana

Cochylis nana (Haworth, 1811)

birch conch

on Betula


the larva, a caterpillar, lives during the summer in a female catkin, that may become somewhat disfigured; in autumn pupation follows in a bark fissure.

host plants

Betulaceae, monophagous

Betula pendula, pubescens.


Boy dirty yellowish-white; head brown; prothoracic plate brownish, rear part darkly punctuated; see Swatschek.


Acornutia, Conchylis, Thyraylia, nana.


Bradley, Tremewan & Smith (1973), Buhr (1964a), Disqué (1905a), Hancock & Bland (2015b), Kovács & Kovács (2020a), Swatschek (1958a).

Last modified 8.iv.2021