Stem borer (Coleoptera: Curculionoidea) in Chenopodium
| Record no.: | 0145 |
|---|---|
| Feeding guild: | Stem borer |
| Taxonomy: | Coleoptera: Curculionoidea: cf. Curculionidae: Cosmobaris sp. |
| Stages observed: | trace, larva, adult |
| Distribution observed: | IA, MN |
| Hosts in Chenopodium: | undetermined C. sp. (lamb's-quarters) |
I reared adults from overwintered dead stems in spring 2017, and photographed larvae in stem pith of dead stems in winter 2025-2026 and living stems in late August 2022. Larvae were pale yellowish grubs with a well-defined, darker head capsule, and are only tentatively placed here with the reared adults from 2017. The adults appeared similar to weevils reared by M. Palmer and identified as Cosmobaris sp. on BugGuide.net (Palmer 2018).
- Palmer, M. 2018. Cosmobaris from Chenopodium sp. dead stems - Cosmobaris scolopacea. Contributor post on BugGuide.net. Retrieved January 9, 2026 from https://bugguide.net/node/view/1580405.[return to in-text citation]
Page created: March 22, 2026. Last update: March 22, 2026