Curculio occidentis

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Filbert weevil
Kaldari Curculio occidentis 01.jpg
A filbert weevil (Curculio occidentis) on an acorn cap
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Coleoptera
Family: Curculionidae
Genus: Curculio
Species: C. occidentis
Binomial name
Curculio occidentis
Linnaeus, 1758

Curculio occidentis, the filbert weevil, is a species of weevil in the genus Curculio. They are considered a pest for many species of oak tree due to the damage they cause to acorns.[1][2]


Curculio occidentis is native to the western side of North America. Its range includes British Columbia in Canada, California, Arizona, New Mexico and Utah in the United States, and Mexico.[3]


The female Curculio occidentis lays small batches of typically two to four eggs in a developing acorn. The resulting larvae feed on the kernel and when fully developed, tunnel out of the nut, fall to the ground and dig themselves a small chamber. They may wait one or two years before pupating.[4]

Together with larva of the filbertworm moth (Cydia latiferreana), the filbert weevil feeds on the acorns of several species of oak tree. In British Columbia, up to 66% of acorns from garry oak (Quercus garryana) were infected with these larvae. These acorns are still able to germinate, but the germination rate is lower than for uninfected nuts.[2]


  1. ^ Filbert Pests in Live Oaks, University of California.
  2. ^ a b Waller, Jennifer (2010). "The Effects of the Filbert Weevil (Curculio occidentis) and the Filbertworm (Cydia latiferreana) on Garry Oak (Quercus garryana) Acorn Germination on Vancouver Island". Vancouver Island University. doi:10.25316/IR-A7. Retrieved 2016-01-08. 
  3. ^ David Hagstrum (2009). Stored-Product Insect Resource. Elsevier. p. 68. ISBN 978-0-12-810456-9. 
  4. ^ Cranshaw, Whitney (2015). Garden Insects of North America: The Ultimate Guide to Backyard Bugs. Princeton University Press. p. 282. ISBN 978-1-4008-6678-6. 

External links[edit]