Korvetto, from Corteva Agriscience, has gained approval for use in Ireland following a UK launch two years ago. 

For use in OSR and containing ArylexTM active in formulation with clopyralid, Korvetto targets the ‘red-faced’ weeds which can emerge above the crop.

It provides activity on broad spectrum of problem weeds, specifically robust control of cleavers, mayweed and, in particular, thistles.

“Even farms which apply good autumn herbicide programmes in a timely manner will usually face a late winter and early spring-germinating broadleaf weed burden” said Liz Glynn, Corteva’s field technical manager for Ireland.

“Korvetto will be a good option for Irish farmers because it will control many of the weeds found in oilseed rape crops as daylight hours increase and temperatures rise.”

Corteva’s Galera (clopyralid+ picloram) has played a leading role in spring-applied oilseed rape herbicide programmes on Irish farms for many years.

Step-change in performance

But Liz says Korvetto represents a step-change in performance.

She said: “Both contain clopyralid, but Korvetto is significantly beefed up by the inclusion of Arylex – the unique herbicide molecule which is used in many of Corteva’s products, such as Belkar.

“The inclusion of Arylex allows farmers to cover a wider spectrum of weeds while gaining a higher level of control.”


The application window for Korvetto is 1 March through to growth stage BBCH50 (flower buds visible above the crop).

An aquatic buffer zone of 5m is required, and the application rate is 1l/ha. The product can only be used once per crop.