2025
With the onset of the warm period, stem weevils become active in winter rapeseed crops. In particular, in various districts of the Dnipropetrovsk region from 8 to 12 beetles are recorded in traps.
This is reported by Serhii Korniushenko, agri-technology development manager for the Southern region of LNZ Group. The specialist says that the cause of this is the mild winter and rapid warming.
"For two days now the temperature has held at a level of +20 °C, and these are ideal conditions for the awakening of the pest, which becomes active at +6…+9 °C mean daily temperature," he explained.
The pest is dangerous in that the females lay eggs in the tips of the young rapeseed shoots. After 7-10 days the larvae begin to gnaw tunnels inside the stems, as a result of which the stems crack and deform. This leads to a decrease in the yield of the crop.
The economic threshold of harmfulness of stem weevils is 10 beetles in 3 days in a trap, or 1 beetle per plant.
To protect the crops in time, the specialist recommends a protection scheme that provides for the application of Atik (acetamiprid, 200 g/kg) at a rate of 0.2 kg/ha, Cyrkul (lambda-cyhalothrin, 50 g/l) at a rate of 0.15 l/ha and Octant Turbo (thiamethoxam, 141 g/l + lambda-cyhalothrin, 106 g/l) at a rate of 0.25 l/ha
