Sulg, SilvaKaasik, RiinaWillow, JonathanVeromann, Eve2022-10-192022-10-192021-09-15Silva Sulg, Riina Kaasik, Jonathan Willow & Eve Veromann (2022) Blue stem weevil (Ceutorhynchus sulcicollis) – a potential threat to oilseed rape production, Acta Agriculturae Scandinavica, Section B — Soil & Plant Science, 72:1, 1-3, DOI: 10.1080/09064710.2021.197738010.1080/09064710.2021.1977380http://hdl.handle.net/20.500.14096/41The Version of Scholarly Record of this Article is published in Acta Agriculturae Scandinavica, Section B — Soil & Plant Science, 2021, available online at: http://www.tandfonline.com/10.1080/09064710.2021.1977380 . © 2022 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Keywords: Ceutorhynchus pallidactylus; stem-mining pest; Brassica; northern Europe; Estonia; CurculionidaeOilseed rape (Brassica napus) has numerous insect pests, some of which are stem-miners. Currently, blue stem weevil (Ceutorhynchus sulcicollis) is not considered a pest of oilseed rape. In the present study, a total of 60 (30 untreated, 30 insecticide-treated) oilseed rape plants were dissected; and stem-mining larvae were collected, and subsequently allowed to pupate in soil. After pupation, all emerged adult weevils were identified as either blue stem weevil (C. sulcicollis) or cabbage stem weevil (Ceutorhynchus pallidactylus). We report that under favourable conditions C. sulcicollis was capable of reaching pest status, and was significantly more abundant than C. pallidactylus, indicating a critical need for future studies regarding C. sulcicollis.enTechnical Report