Ceutorhynchus obstrictus
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Source: Wikimedia Commons
Ceutorhynchus obstrictus (Marsham, 1802) - (cabbage seedpod weevil)
The weevil attacks the buds and the pods of rape/canola and colza. It can also cause serious damage for producers of seeds of cabbage and radish. On rape/canola losses of up to 70% and averages of 20-40% have been reported in North America. It is native to Europe and has been found in North America since 1931 (first record in British Columbia).
There is one generation per year and the development from egg to adult lasts around 2 months. The adults feed on the flower buds and the young seed pods. They lay eggs in the young pods, typically only 1 per pod, and the young larva feeds on the developing seeds inside the pod. The mature larva leaves the pod and pupates in the ground. The young adults emerge in autumn. After feeding, they migrate to overwintering sites (leaf litter and soil). In spring, the re-emerging adults might feed on cruciferous weeds before a new crop is planted.
| Vernacular names | |
|---|---|
| • Deutsch: | Rapsrüssler Kohlschotenrüssler |
| • English: | cabbage seedpod weevil cabbage seed weevil |
| • Español: | ceutorinco de la colza gorgojo de las silicuas de la colza |
| • Français: | ceutorhynchque des siliques charançon de la graine du chou charançon des siliques de crucifères charançon des siliques de colza |
For control in canola, it is recommended to plant a trap crop (e.g. an early flowering Brassica species) along the edges of the field which is then sprayed with insecticides. Crop rotation is another option.
The adult is black or dark grey, with a wide body and around 3-4 mm long. The proboscis is curved and shiny. The long legs and the elytra have whitish scales. When disturbed, adults fold their legs to the body, drop to the ground and remain motionless for a few seconds. Some of the common names listed in the box are applicable to Ceutorhynchus species damaging cabbage and other Brassica species.
Taxonomic notes
There are two main species of Ceutorhynchus which are regarded as serious crop pests, Ceutorhynchus obstrictus and Ceutorhynchus assimilis. Both species are pests in Europe and both are morphologically very similar, but only C. obstrictus is invasive in North America. C. assimilis is only found in Europe. Until the 1990s the invasive C. obstrictus in North America has been incorrectly referred to as C. assimilis.
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