Young OSR Field

Post-emergence weed control in OSR starts here

With the majority of oilseed rape crops getting off to a flying start thanks to favourable conditions towards the end of the summer, the potential for a successful harvest remains high.

However, despite crops establishing quickly and growing away from the risk of adult flea beetle damage, that doesn’t mean growers should become complacent: a successful harvest remains a long way off, with crops still in need of careful management, particularly in terms of weed control.
Autumn blog
11 November, 2026
5min read
Young OSR Field

As we enter the latter stages of autumn, there’s still time to protect crops against the usual array of weeds that can hamper the crop’s progress when warmer conditions return in the spring, with the application of FOX® (480 g/L bifenox) offering excellent levels of control of a wide spectrum of weeds.

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FOX® can be applied up until BBCH 19 (end of leaf development) and should be used as per the recommendations outlined below.

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FOX® usage recommendations 

Efficacy: 

  • Target small weeds 

  • Aim to achieve good leaf coverage by applying at a water volume of 200L/ha 

  • The addition of oil usually delivers the best efficacy 

     

Crop safety: 

  • All the crop to re-wax after multiple frosts 

  • Allow a minimum of 10 days between other applications and FOX® 

  • Only apply to a dry crop 

     

Do NOT: 

  • Use below 5oC 

  • Treat stressed or pest damaged crops 

  • Mix with insecticides 

  • Use full rate with other herbicides 

Post-emergence weed control in winter OSR and cereals 

FOX® is also a useful option for weed control in cereal crops when it can be applied up to BBCH 29 (end of tillering).

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FOX® (480 g/L bifenox) 

A herbicide for the post-emergence control of a wide range of broad-leaved weeds in winter oilseed rape and winter cereals. 

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