Bug FAQAsian Oak Weevil
Cyrtepistomus castaneus · Order: Coleoptera · Family: Curculionidae
Also called: Asiatic Oak Weevil, Weevil
Source: Wikipedia
Cyrtepistomus castaneus is an Asian broad-nosed weevil in the Curculionidae family. Adults eat the foliage of oak (Quercus) and red maple (Acer rubrum), while larvae feed on root hairs in the soil. It originates from Asia.
Source: Wikipedia
How to recognize it
It is an Asian broad-nosed weevil belonging to the beetle family Curculionidae.
Source: Wikipedia
Where it lives
Larvae live in soil feeding on root hairs; adults are found on oak and red maple trees where they eat leaves.
Source: Wikipedia
What it eats
Larvae consume root hairs in the soil, and adults defoliate oak and red maple trees.
Source: Wikipedia
Where it comes from
The species is native to Asia.
Source: Wikipedia
Where it is found in the US
Recorded in 39 of 51 states and DC. Most records: Pennsylvania, Massachusetts, Virginia, North Carolina, New York, Maryland, Tennessee, Ohio.
Darker = more records. Counts are museum and citizen-science records, not population size.
Source: GBIF
Status: introduced in United States. Source: iNaturalist
Months it is reported in the US
Source: GBIF
More photos
Questions people ask
What trees do they damage?
Adults feed on the leaves of oak (Quercus) and red maple (Acer rubrum), causing defoliation.
Source: Wikipedia
Same family (Curculionidae)
Green Immigrant Leaf WeevilPolydrusus formosusDamages trees, gardens or crops
Black Vine WeevilOtiorhynchus sulcatusDamages trees, gardens or crops
Nettle weevilPhyllobius pomaceusDamages trees, gardens or crops
Strawberry Root WeevilOtiorhynchus ovatusDamages trees, gardens or crops
Common Leaf WeevilPhyllobius pyriDamages trees, gardens or crops
Large Pine WeevilHylobius abietisDamages trees, gardens or cropsSources
- Wikipedia: https://en.wikipedia.org/wiki/Cyrtepistomus_castaneus
Look it up elsewhere: GBIF · iNaturalist · BugGuide · ITIS · Wikipedia
Text written 2026-10-22 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-22.