Bug FAQBirch Conch
Thyraylia nana · Order: Lepidoptera · Family: Tortricidae
It lives in Europe, the Amur region of Russia and Nova Scotia in Canada, where its larvae feed on birch trees.
Source: Wikipedia
How to recognize it
The forewing costa is gently arched. The tip area of the forewing is clouded with a pale ochre colour.
Source: Wikipedia
Size
The wingspan ranges from 9 to 12 mm (0.35 to 0.47 in).
Source: Wikipedia
Where it lives
It is found in Europe, the Amur Oblast of Russia and Nova Scotia, Canada.
Source: Wikipedia
What it eats
The larvae feed on birch species.
Source: Wikipedia
Life cycle
Adults are on the wing from mid-April to mid-June.
Source: Wikipedia
When you see it
The flight period is mid-April through mid-June.
Source: Wikipedia
Where it comes from
Its native range includes Europe, the Amur region of Russia and Nova Scotia in Canada.
Source: Wikipedia
Where it is found in the US
Recorded in 25 of 51 states and DC. Most records: Massachusetts, Connecticut, Washington, Vermont, New York, Pennsylvania, Maine, Michigan.
Darker = more records. Counts are museum and citizen-science records, not population size.
Source: GBIF
Status: native in North America; native in Canada; native in United States. Source: iNaturalist
Months it is reported in the US
Source: GBIF
More photos
Same family (Tortricidae)
Oblique-banded Leafroller MothChoristoneura rosaceanaDamages trees, gardens or crops
Garden TortrixClepsis peritanaDamages trees, gardens or crops
Common MarbleSyricoris lacunanaDamages trees, gardens or crops
Red-banded Leafroller MothArgyrotaenia velutinanaDamages trees, gardens or crops
Light Brown Apple MothEpiphyas postvittanaDamages trees, gardens or crops
Aster and Reddish Eucosma Moths and AlliesEucosma parmatanaSources
- Wikipedia: https://en.wikipedia.org/wiki/Cochylis_nana
Look it up elsewhere: GBIF · iNaturalist · BugGuide · Wikipedia
Text written 2026-10-27 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-27.