Bug FAQAmerican Utilizable Wood Bark Beetle
Gnathotrichus materiarius · Order: Coleoptera · Family: Curculionidae
Adults carry a fungus into tree wood, and both adults and larvae feed on that fungus.
Source: Wikipedia
Where it lives
It lives in partnership with the fungus Endomycopsis fasciculata, which the beetles introduce into the wood of host trees.
Source: Wikipedia
What it eats
The fungus serves as the main food for both larvae and adult beetles.
Source: Wikipedia
Where it comes from
It is native to North America.
Source: Wikipedia
Where it is found in the US
Recorded in 22 of 51 states and DC. Most records: Michigan, Vermont, Texas, Pennsylvania, Florida, Colorado, North Carolina, Kansas.
Darker = more records. Counts are museum and citizen-science records, not population size.
Source: GBIF
Status: native in North America; native in Canada. Source: iNaturalist
Months it is reported in the US
Source: GBIF
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
Asian Oak WeevilCyrtepistomus castaneusDamages trees, gardens or crops
Strawberry Root WeevilOtiorhynchus ovatusDamages trees, gardens or crops
Common Leaf WeevilPhyllobius pyriDamages trees, gardens or cropsSources
- Wikipedia: https://en.wikipedia.org/wiki/Gnathotrichus_materiarius
Look it up elsewhere: GBIF · iNaturalist · BugGuide · ITIS · Wikipedia
Text written 2026-10-24 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-24.