New iOSR site uncovers CSFB establishment techniques
A new iOSR trials site in Norfolk is set to evaluate innovative establishment techniques to minimise the impact of cabbage stem flea beetle (CSFB), along with new agronomic techniques in the growing season to enhance oilseed rape yields.
Set up on the farm of iOSR grower, Chris Eglington, at Letton, near Shipdham, initial trials are evaluating establishment techniques including under a cover of straw or applying a covering of pig manure to repel the damaging beetle. The site also includes buckwheat/berseem clover cover crop.
For field scale trials, Mr Eglington has also established crops of hybrid vs a conventional varieties - both TuYV resistant - along with establishment by the farm’s precision drill vs a new Väderstad Rapid system. There is also a field scale tramline of the companion crop.
Syngenta Technical Manager, Dr Max Newbert, reported initial crop emergence from early August drilling looked positive, with good soil temperatures. “Although some early shot-holing was visible from CSFB, flea beetle and Wessex flea beetle all identified on the site, we are hoping plants can grow away fast enough to limit the impacts of damage.
The OSR at the first drill timing in mid-august had reached BBCH13 in just 10 days and was well established in the field scale trials; with the second August drill timing emerged at cotyledon stage with minimal damage.
“Across the trials we will be trialling treatments with Hallmark Zeon - the most effective pyrethroid available to growers - to identify timing and techniques that could still offer benefit, even where insecticide resistance may be an issue,” reported.
“Untreated plots and alongside the cover crops will also be assesed for the effect beneficial predators may have in limiting impacts of adult beetles on emerging seedlings, as well as later CSFB larvae effects in growing plants.”
CSFB populations will also be collected and sampled for resistance monitoring, as well as assessing implications of recolonisation from migration.
Dr Newbert highlighted results of the Syngenta iOSR trials and monitoring are being collated to include into a larger industry-wide project, addressing integrated pest management techniques to tackle CSFB losses.