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.

Autumn weed control in oilseed rape

Belkar^®

As oilseed rape continues to grow and establish with the mild autumn, now is the perfect time to apply Belkar, delivering robust control of broad-leaved weeds such as cleavers, cranesbill, fumitory, poppies, shepherd’s purse and more.

With the mild weather, there are some big crops of winter oilseed rape about. We’ve seen no decline in control from Belkar, even when applied to crops with a canopy cover exceeding 90%.

Weather-resilient performance

If the weather becomes more typical for autumn, Belkar has good flexibility for application conditions including working at temperatures as low as 2°C and rainfast in an hour. View the Belkar Technical Information Sheet for more information.

Flexible application rates

0.25 l/ha from GS12 (2 leaves unfolded) up to 0.5 l/ha from GS16 (6 leaves unfolded, from 15^th Sept onwards).

Tank mix flexibility

Belkar can be tank mixed with graminicides for volunteer cereals and Astrokerb for extended weed control. Please refer to our Tank Mix Sheet for full compatibility.

Astrokerb^® and Kerb^® Flo

As soil temperatures begin to fall, it’s time to plan your propyzamide applications for effective control of black-grass, ryegrass, brome, and key broad-leaved weeds in winter oilseed rape.

Astrokerb:

Contains propyzamide + aminopyralid
As well as grass weed control, Astrokerb provides effective control of ALS-resistant poppies, mayweeds, cleavers, chickweed and speedwells

Kerb Flo:

Contains propyzamide
Approved for use in winter beans and OSR
Controls grass weeds and a range of broad-leaved weeds including black bindweed, fat hen, knotgrass, speedwell

Application timing, stewardship and best practice

Apply when soil temperature at 30cm is below 10°C and falling
Moist soils are essential for herbicide movement into the root zone
Avoid waterlogged conditions
Apply at the right rate, right conditions, right time
750g ai/ha for good control
840g ai/ha for robust control in heavy infestations
Use the Kerb Weather Data traffic light system to guide timing decisions

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.

Astrokerb®

Kerb® Flo

Belkar®

Korvetto®

Latest OSR news and technical advice

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. Download the topic sheet here.

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. Read it here.

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. Find out more here.