''Cosmopterix zieglerella'' is a moth of the family Cosmopterigidae. It is found from most of Europe (except Ireland and the

Balkan Peninsula The Balkans ( ), also known as the Balkan Peninsula, is a geographical area in southeastern Europe with various geographical and historical definitions. The region takes its name from the Balkan Mountains that stretch throughout the who ...

) east to

Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...

. The wingspan is 8–11 mm. Adults are on wing in June and July. The larvae feed on '' Humulus lupulus''. They mine the leaves of their host plant. The mine has the form of a broad full depth corridor overlying the main veins, with broad lobelike, transparent extensions into the blade. The corridor itself is opaque and white at first, but later turns brown. The corridor are covered with silk at the inside. Most

frass Frass refers loosely to the more or less solid excreta of insects, and to certain other related matter. Definition and etymology ''Frass'' is an informal term and accordingly it is variously used and variously defined. It is derived from the G ...

is ejected from the mine and grains may be trapped in silk below the mine. Pupation takes place outside of the mine.

References

zieglerella Moths of Asia Moths of Europe Moths described in 1810 Humulus {{Cosmopterix-stub