New late blight fungicide registered for Irish potato growers


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02 December 2022
New formulated oxathiopiprolin product.

CORTEVA Agriscience’s chemistry, oxathiopiprolin, a product for the prevention of late blight in potatoes, is now available for Irish farmers in a new formulated product Zorvec Entecta.
Zorvec Entecta is a liquid formulation combining the Zorvec active (oxathiopiprolin) with amisulbrom in a one-litre bottle, providing protection from late blight for up to 10 days after application. 
Corteva launched the Zorvec active in 2018 and it was originally sold in co-packs. More recently, it was available in co-from with benthiovalicarb as Zorvec Endavia. Since then it has played a significant role in evolving blight strategies, owing to its robust preventative activity and the ability to stretch intervals to 10 days between applications.
As well as tackling late blight present in the plant, it moves systemically to protect new growth.
Category Manager for Potatoes at Corteva, Alister McRobbie, said Irish growers will benefit from access to the new product in 2023.

Data from the James Hutton institute revealed that blight strains found in UK and Ireland continue to evolve, making for a particular dynamic and challenging population.
The 6 A1 strain continues to account for a significant proportion of the population, although it is being steadily displaced by the more aggressive 36 A2 strain in the UK.
“We are seeing no let-up in the challenge facing growers, who will continue to need effective chemistry that allows them to create programmes that fight disease and counter the threat of resistance,” Alister said.
Farmers can apply Zorvec Entecta at 0.25l/ha up to four times during a season. In order to get the most from the product, growers should consider making two applications during the rapid growth phase, making best use of its curative, preventative and systemic activity. 
Retaining a further two applications for the latter half of the programme at the stable canopy phase of the crop. These should be timed to tackle increases in the late blight threat as indicated by forecasting systems.

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