Ceutorhynchus assimilis
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Ceutorhynchus assimilis (Paykull & G.de, 1792)
This weevil is a pest of cabbage and other Brassica crops in Europe, damaging the young seedpods. While it damages cabbage crops grown for seed production, it is regarded as a serious pest of rapeseed crops. The adults attack the young seedpods and lay one egg in each pod. These pods are then marked to prevent attack by other females. The larvae develop in the pods for 5-6 weeks and the mature larvae leave the pods to pupate in the soil. There are typically two generations per year. Several other plants from the family Brassicaceae have been also recorded as hosts.
Until the 1990s Ceutorhynchus assimilis has been reported as invasive in North America. However the North American species has been determined to be Ceutorhynchus obstrictus. In Europe, both species are native, but C. assimilis is more often reported as a pest. The taxonomy of both species has been studied and clarified by E. Colonnelli (1993).
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