In Repce, is the pest deciding the crop yield?

The large rapeseed stem weevil: the early invader The large rapeseed stem weevil (Ceutorhynchus napi) is predicted with a yellow sticky board or yellow pan. The emergence of the beetles from the soil generally begins above 6 °C, however, at temperatures around 9 °C, their mass appearance should be expected. The females lay their eggs directly into the rapeseed stem. The hatched larvae develop inside the stem, where their chewing causes significant damage. The fully developed larvae leave the plant after the damage is completed and pupate in the upper 4–6 cm layer of the soil. The adults only appear at the end of autumn and then hide in the soil for hibernation. Damage from the large rapeseed stem weevil causes the rapeseed stem to deform, twist and significantly shorten. Longitudinal cracking of the stem is also common. The flowering of the infected plants becomes prolonged, and the ripening of the pods and seeds is uneven, which can result in significant crop loss. The rapeseed ...