Ceutorhynchus contractus Marsham Turnip stem weevil

This weevil is associated with Sinapis arvensis and various other wild related hosts. It is also reported, occasionally, as a minor pest of cultivated Brassicaceae, especially turnip. The larvae (which are creamish-white with a brown head) feed within the petioles, each forming a short, greenish gallery. Although some eggs are laid in the autumn, most are deposited in the early spring, soon after the adults emerge from hibernation. Larvae complete their development in May or early June, and the next generation of adults emerges from June onwards. Adults are 2 mm long and mainly bluish-black or greenish-black, with a coppery sheen; the rostrum is relatively short and broad.

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