Acorn-weevil
Guides
Conotrachelus posticatus
Oak Curculio
Conotrachelus posticatus is a small weevil (3.7–5 mm) commonly known as the Oak Curculio, native to North America with a range extending from Canada to Panama. The species is a specialist on oak acorns, using them for both larval development and adult feeding. Females oviposit in acorn seeds, and larvae complete development inside the nut, passing through five instars over 10–30 days depending on host species. Adults emerge in late spring and early summer, with a second winter spent hibernating under leaf litter. The species possesses a stridulatory mechanism for sound production and has been identified as a potential threat to the avocado industry, though its primary ecological role involves oak seed predation with complex implications for forest regeneration.
Curculio confusor
Curculio confusor is a species of true weevil in the family Curculionidae, first described by Hamilton in 1893. It belongs to the genus Curculio, a group of weevils commonly known as acorn or nut weevils due to their association with hard mast. The species is known from North America, with confirmed records from Ontario, Canada.
Curculio occidentis
filbert weevil, California Acorn Weevil
Curculio occidentis, the filbert weevil, is a weevil species native to western North America. It is primarily known as a seed predator of oak acorns, with documented infestations on Garry oak (Quercus garryana), coast live oak (Quercus agrifolia), and other oak species. The species has also been recorded feeding on hazelnuts (Corylus avellana), though it generally prefers endemic oak species and rarely causes economic damage to commercial hazelnut crops. Females lay small batches of 2-4 eggs in developing acorns; larvae feed on kernels and exit in autumn to pupate in soil, potentially remaining dormant for 1-2 years before adult emergence.
Curculio orthorhynchus
Curculio orthorhynchus is a species of true weevil in the family Curculionidae, first described by Chittenden in 1908 under the basionym Balaninus orthorhynchus. The species is native to North America and belongs to the genus Curculio, a group of weevils commonly known as acorn or nut weevils due to their association with developing nuts and fruits. Very little specific biological information has been published for this particular species.
Curculio pardalis
Curculio pardalis is a species of true weevil in the beetle family Curculionidae, first described by F.H. Chittenden in 1908. It belongs to the genus Curculio, which includes numerous nut- and acorn-feeding weevils. The species is known from North America, with records from the Canadian provinces of Manitoba, Ontario, and Québec. Like other members of its genus, it likely develops within nuts or acorns, though specific host associations remain unconfirmed.