Early Rapeseed Flea Beetle Infestation Threatens UK Crops
Unseasonably cool temperatures in late September triggered an early egg-laying season for rapeseed flea beetles, leading to an increased infestation in the UK's rapeseed fields. Farmers are advised to monitor their crops closely and consider various control measures to manage this pest and other emerging threats.
The recent invasion of flea beetles, which occurred over the weekend of September 20th and 21st, has prompted concern among farmers. TLLLR reports that aphids are also starting to invade rapeseed crops. To control flea beetle larvae, farmers should consider systemic agents when more than 50 to 75 flea beetles per yellow pod have been sighted within three weeks. Carnadine, while effective against early larval stages and aphids, has lower efficacy on adult flea beetles compared to Cyantraniliprole.
For comprehensive control, farmers can use Minceto Gold or Exirel, which work against both adult rapeseed flea beetles and their larvae. Additionally, Acetamiprid (Carnadine) and Cyantraniliprole (Minceto Gold, Exirel) are permitted for treating flea beetle larvae and adult rapeseed flea beetles. To protect against rape stem weevil larvae, systemic agents like Acetamiprid and Cyantraniliprole can be used effectively from the second week of October 2025, as they are absorbed by the plant and target larvae feeding inside plant tissues.
Farmers are also advised to apply growth regulators at the 4-leaf stage of rapeseed to prevent plants from becoming too large and compromising their winter-hardiness.
Farmers are urged to stay vigilant and proactive in managing flea beetle and aphid infestations in their rapeseed fields. By monitoring pest activity, selecting appropriate control measures, and timing applications effectively, they can help protect their crops and ensure a successful harvest.
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