Ceutorhynchus napi Gyllenhal, 1837

rape stem weevil

on Brassicaceae

Ceutorhynchus napi: larva in Brassica napus stem

Brassica napus, Hungary, Mosonmagyaróvár © László Érsek: larva boring in the stem

Ceutorhynchus napi: damage to Brassica napus stem

th stem swells and tears open (picture taken on April 9) …

Ceutorhynchus napi: damage to Brassica napus stem

… and becomes seriously destroyed (April 22)

mine

The larva essentially is a borer in petiole or stem. Some larvae (“many”, according to Hering [1957a], “1-3”, according to Scherf [1964a]) live there together in a cavity. At that point the stems is galled and swollen. From there sometimes a larva strays into the leaf blade.

hostplants

Brassicaceae, oligophagous

Barbarea intermedia; Brassica napus, oleracea, rapa; Raphanus raphanistrum; Sinapis arvensis; Sisymbrium altissimum, officinale.

phenology

Larvae in April-July (Scherf, 1964a).

BENELUX

BE observed (Curculionidae.be, 2010a).

NE observed (Fauna Europaea, 2007; Heijerman, 1993a).

LUX not observed (Fauna Europaea, 2007).

distribution within Europe

From Denmark and Poland tot the Iberian Peninsula and from France to Bulgaria; not in the British Isles (Fauna Europaea, 2007).

larva

Scherf (1964a).

references

Buhr (1964b, 1965a), Günthart (1949a), Heijerman (1993a), Hering (1957a), Houard (1908a), Scherf (1964a), Tomasi (2014a), Vorst (2010a).

mod 21.vi.2018