Coast-live-oak
Guides
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.