Bug FAQMorrison's Borer Moth
Pelochrista morrisoni · Order: Lepidoptera · Family: Tortricidae
The Morrison's Borer Moth has forewings that measure between about 7 and 10 mm in length. It lives in western North America, ranging from Washington eastward to Michigan. Adults are on the wing from June through August.
Source: Wikipedia
Size
Forewing length is 7.3 to 10.5 mm.
Source: Wikipedia
Where it lives
Found in western U.S. states and from Washington to Michigan.
Source: Wikipedia
When you see it
Adults fly from June to August.
Source: Wikipedia
Where it comes from
Native to western North America, extending east to Michigan.
Source: Wikipedia
Where it is found in the US
Recorded in 12 of 51 states and DC. Most records: Montana, New Mexico, Minnesota, Colorado, Wisconsin, Nebraska, Iowa, Utah.
Darker = more records. Counts are museum and citizen-science records, not population size.
Source: GBIF
Status: native in North America; native in United States; native in Canada. Source: iNaturalist
Months it is reported in the US
Source: GBIF
Questions people ask
When are adult Morrison's Borer Moths active?
Adults are on the wing from June through August.
Source: Wikipedia
How big are Morrison's Borer Moths?
Their forewings measure about 7.3 to 10.5 mm long.
Source: Wikipedia
Where can I find Morrison's Borer Moths?
They occur in western U.S. states and from Washington east to Michigan.
Source: Wikipedia
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/Eucosma_morrisoni
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.