Bug FAQStigmella longisacca
Stigmella longisacca · Order: Lepidoptera · Family: Nepticulidae
Source: Wikipedia
The adult has a wingspan of about 3.2 to 4.4 mm. It is found in California, United States. There are usually two, possibly three, generations each year.
Source: Wikipedia
Size
Adults measure 3.2 to 4.4 mm across the wings.
Source: Wikipedia
Where it lives
This species occurs in California.
Source: Wikipedia
What it eats
Larvae feed on walnut trees such as Juglans californica. They create mines inside the leaves of their host plants.
Source: Wikipedia
Life cycle
The moth produces two, and possibly three, generations per year.
Source: Wikipedia
Where it comes from
It is native to California, United States.
Source: Wikipedia
Where it is found in the US
Recorded in 1 of 51 states and DC. Most records: California.
Darker = more records. Counts are museum and citizen-science records, not population size.
Source: GBIF
Months it is reported in the US
Source: GBIF
More photos
Questions people ask
What trees do the larvae feed on?
The larvae feed on walnut species, including Juglans californica.
Source: Wikipedia
How many generations does Stigmella longisacca have each year?
It has two, and possibly three, generations annually.
Source: Wikipedia
Same family (Nepticulidae)
Golden PigmyStigmella aurellaDamages trees, gardens or crops
Stigmella prunifoliella groupStigmella prunifoliellaDamages trees, gardens or crops
Hazel Leafminer MothStigmella microtheriellaDamages trees, gardens or crops
Stigmella quercipulchella groupStigmella quercipulchella
Stigmella intermedia
Stigmella rhoifoliellaSources
- Wikipedia: https://en.wikipedia.org/wiki/Stigmella_longisacca
Look it up elsewhere: GBIF · iNaturalist · BugGuide · Wikipedia
Text written 2026-10-28 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-28.