Find information on oilseed rape herbicides
Corteva is committed to delivering the tools Irish farmers need to secure oilseed rape’s valuable position for years to come.
Oilseed rape: from Hybrid to Harvest
With our innovative R&D pipeline, fantastic hybrid varieties alongside proven crop protection products, Corteva is helping Irish farmers to maximise the potential of their crops.
Winter weed control in oilseed rape
With some great crops of oilseed rape out there and winter arriving, the challenges increase with more unpredictable cooler weather, crops opening up allowing for further weed emergence.
Here are some of Corteva's top weed control recommendations:
- Apply propyzamide before the deadline: the cut-off for Astrokerb® and Kerb® Flo is 31st January. Complete all stewardship checks before applying.
- Extra broad-leaved weed control?: Belkar® can tank mixed with Astrokerb or Kerb Flo.
- Plan ahead for weed management: as crops open up in spring, review weed pressure and order Korvetto® for a thorough clean-up.
Astrokerb and Kerb Flo FAQs
Can I tank mix Belkar with Kerb Flo or Astrokerb?
Yes, Kerb Flo or Astrokerb are compatible with Belkar for additional broad-leaved weed control and can be mixed with approved graminicides or fungicides to avoid extra spray passes.
Do I need a dry leaf for application?
No, Kerb Flo is soil-acting, so spraying wet weeds or light rainfall after application is not an issue.
Do I need a dry leaf for Astrokerb?
Ideally apply to a drying leaf. Rainfastness for the aminopyralid component is about 1 hour; heavy rain within that time may reduce efficacy.
What is the rainfast period for Astrokerb?
For the aminopyralid component, rainfastness is approximately 1 hour. Avoid spraying if heavy rain is imminent.
What stewardship steps should I follow for Kerb Flo or Astrokerb?
Check field drains, avoid spraying near watercourses and follow buffer zone requirements. Always complete your propyzamide stewardship checklist before application.
Latest OSR news and technical advice
Oilseed rape - should I stay or should I grow
From drilling dilemmas to weed control with Belkar® and Kerb®, get expert guidance on managing your oilseed rape for a top gross margin this season.
Herbicide programme options for oilseed rape
Corteva’s portfolio of oilseed rape herbicides offer flexible, reliable control across a wide spectrum of weeds and timings. They can fit into the programme based on the season and target weeds.
Corteva's oilseed rape business update - July 2025
Check out latest OSR update to find out more about this season's top Pioneer hybrids & our wide range of solutions for OSR growers.
Instinct® nitrogen stabiliser
Nitrogen use efficiency is about getting the most from every kilo of applied nitrogen. It's well-known that significant amounts of nitrogen can escape from fields as nitrate into water courses, and the atmosphere as nitrous oxide. If nitrogen is not in the soil, crops can’t access it, which limits yield potential and is environmentally unsustainable. Instinct keeps more nitrogen in the soil for longer, improving nitrogen use efficiency.
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Find information on oilseed rape varieties
We have a wide selection of Pioneer® winter oilseed rape hybrids that have been extensively trialled across the UK and Ireland.
Video resources
Propyzamide - Back to Basics
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