Ceutorhynchus obstrictus    



common name     Cabbage seedpod weevil

habitat
Agricultural areas where oilseed is produced, roadside ditches, disturbed weedy areas.

seasonality
One generation per year. Ceutorhynchus obstrictus is common from late May to late August.

identification
Adults have round grey bodies (2-4 mm in length) and grey legs covered with fine white scales. Ceutorhynchus obstrictus has a long curved proboscis with small bent antennae. When disturbed, it displays the interesting behavior of folding its legs and proboscis against its body to make it look like a small grey pebble. Similar in appearance to its co-generic C. neglectus it can be differentiated by its bigger size and grey body color.

life history
Single spheroid eggs are deposited into immature crucifer (Brassica sp.) pods. Larvae undergo three larval instars within the pods and feed on developing seeds. Mature larvae bore out the side of the pod and burrow into the soil. Adults emerge 10-14 days after pupation begins. Adults feed for the remainder of the season on pods and flowers storing fats for overwintering (Dmoch 1965).

conservation
Not a concern. Ceutorhynchus obstrictus is common and considered a serious pest throughout most of its range.

diet info
Larvae feed on seeds within pods of large crucifers (Brassica sp.). Adults feed on flowers, pods, or young cotyledons of crucifers (Brassica rapa, Brassica napus, Descurainia sophia, Lepidium draba, Sinapis alba, Thlaspi arvense), especially canola or oilseed crops (Fox and Dosdall 2003).

range
Native to Europe, it can be found from Scandinavia to the Mediterranean and England to Russia and is common anywhere oilseed is being produced (Hill 1987). In North America it is thought to occur all across the U.S. as well as into southern British Columbia, Alberta, Saskatchewan, Ontario and Quebec (Laffin et al. 2005).

people
species page authorLaffin, R. D.2005 

quick link
http://entomology.museums.ualberta.ca/searching_species_details.php?s=5440

 

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