Ceutorhynchus napi

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Ceutorhynchus napi (click on image to enlarge it)
Author(s): Willow Warren, Department of Agriculture Western Australia
Source: PaDIL

Ceutorhynchus napi Gyllenhal, 1837 - (rape stem weevil)

The weevil is found in central and southern Europe where it attacks oilseed rape and cabbage. Yield losses of up to 30% have been reported. The adult overwinters in the soil and emerges in early spring when the temperatures reach 10°C. After an initial feeding period, it lays individual eggs on the main stem of the rape plant, close to the growing point. The young larva bores into the pith of the stem and development, through 3 larval stages, is completed in about 5 weeks. The mature larva leaves the stem and pupates in the ground. The young adult emerges from the pupa about one month later. However, it remains in the pupal chamber until spring in the coming year.

Vernacular names
• Deutsch: Rapsstengelrüssler
Grosser Kohltriebrüssler
Grosser Rapsstengelrüssler
• English: rape stem weevil
• Español: ceutorinco del nabo
gorgojo del tallo de la colza
• Français: ceutorhynque du navet
gros charançon du colza
charançon de la tige du colza

The adults are 3-4 mm long and covered with grey scales/hairs. The elytra have deep longitudinal groves with 3 rows of whitish hair along the elytra surface between 2 groves. The rostrum is long an curved. C. napi resembles Ceutorhynchus pallidactylus which has a similar biology and host range. However, it is slightly larger, more greyish (rather than black) with black tarsi (reddish brown in C. pallidactylus).