Agronomy Update: Managing Autumn Diseases in Oilseed Rape

Oilseed rape crops are looking strong across the UK this autumn, but with conditions currently favourable for Phoma and Light Leaf Spot, now is the time to review your disease management strategy.

Reminder for Key Disease Thresholds

Phoma: Treat when 10–20% of plants are infected.
Use lower threshold on more susceptible varieties and/or where plants are small.

Light Leaf Spot: Treat as soon as infection is seen and confirmed.
To confirm disease presence, incubate leaves.

Cost-Effective Fungicide Options

Clayton Navaro

• Dual- active 125g/l prothioconazole & 125g tebuconazole co-formulation
• One product solution for early autumn disease control
• Targeting damaging Light leaf spot and Phoma
• Additional beneficial growth regulatory effect on forward crops

Clayton Finch & Clayton Trellis

• Dual-active 160g/l prothioconazole and 80g/l tebuconazole co-formulation
• Effective control of Phoma leaf spot/stem canker with moderate control of light leaf spot
• Cost-effective disease control option

Clayton Tebucon 250 EW

• High-loaded straight 250g/l tebuconazole formulation
• Additional beneficial growth regulatory effect on forward crops

Clayton Tuskar

• High-loaded straight 250g/l prothioconazole formulation
• Targeting damaging Light leaf spot and Phoma
• Flexible tank mix compatibility options with other autumn actives

Summary

With crops advancing quickly and weather favouring disease development, timely fungicide protection is key to maintaining crop health, canopy structure, and yield potential.
Keep in mind key disease thresholds and stay alert for any visible signs of infections.

Autumn OSR Fungicides Product Guide 2025

For further advice or support, please contact Will Ridgwell (Will@claytonpp.com) or Jessie Boden (Jessie@claytonpp.com).