Simon’s Seasonal Insights – Rain Relief Bring Unwelcome Brassica Disease Increase
December 2026 brassica crop highlights
- Recent rainfall has revived crop growth
- Leaf wetness and mild weather raises risks
- Latent light leaf spot could still break out
- New fungicide products look good in trials
- Winter veg meetings will review results and suggest strategies
02 December 2025, UK: As another difficult growing season draws to an end, some welcome rainfall has thankfully promoted better growth and improved crop yield potential. It has also helped reduce insect pressure, bringing a bit of relief over quality concerns.
However, prolonged leaf wetness, combined with mild weather in the last few weeks, means fungicides are still needed to ensure disease control on Brussels sprouts and late crops.
Once, or if, temperatures do fall it should bring an end to new infection of most diseases, with the exception of light leaf spot. With this in mind a further fungicide would be recommended to ensure latent undeveloped disease is controlled – since spots can take a while to appear in cooler temperatures.
Although many crops appear to have little disease, a picture from the untreated area of one of our fungicide trials helps illustrate the level of disease that could have been present without control. It always amazes have clean crops early October can develop significant disease if untreated.
This trial also shows the effectiveness of AMISTAR® Top and what the new development active ingredient, adepydin, will bring to disease control in the future.
On the subject of new products, hopefully the news that ORONDIS® Vip has been approved is known by all and now covers brassica crops, as well as alliums and salads and a useful group of other vegetable crops.
This new solution for the control of downy mildew will be available next year, and has approval on broccoli, Brussels sprouts, cabbage and cauliflower. It is very effective against systemic downy mildew and, as it contains metalaxyl-m as well as oxathiapiprolin, it will give good control of other oomycete diseases.
As usual we will be inviting you to our vegetable meetings in the new year. Despite the season, our trials have delivered some good data for discussion.
With a dry and difficult summer, we have some interesting messages on our biologicals portfolio and, due to the rain through October, we also have some good fungicide trial results.
Keep an eye on your emails for an invite.
Also Read: XAG’s New R Series Rover Powers Smart Automation in Specialty Crop Farming
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