Performance data for new wheat fungicide released

The Agriculture and Horticulture Development Board (AHDB) has released UK fungicide performance data for a newly authorised wheat product in that market – Univoq.

Based on a new mode of action, Univoq should help protect the long-term efficacy of key wheat fungicides and provide a valuable option for in-season disease control.

The broad-spectrum fungicide closely matches leading SDHI/azole combinations in its activity against major foliar wheat diseases.

Testing new wheat fungicide product

ADAS is the UK’s largest independent provider of agricultural and environmental consultancy, rural development services and policy advice.

ADAS representative Jonathan Blake, who works on AHDB-funded fungicide performance trials, said:

“We test products under code so we can release the independent performance data once UK approval has been granted.

“Univoq has performed well in trials. Its novel mode of action means it adds value: not just in terms of its own efficacy, but in its ability to protect other chemistry.”

Authorised for use in wheat (latest application timing growth stage 69), Univoq (Corteva Agriscience) contains fenpicoxamid in mixture with the established active prothioconazole.

Fenpicoxamid (also referred to as Inatreq) is a quinone inside inhibitor (QoI) – a new mode of action for cereal disease management.

This means it targets pathogens in a different way to azoles, SDHIs and strobilurins.

According to AHDB scientists,it could help improve the effective life of SDHIs and azoles, through its use in mixtures and in alternation in wheat fungicide programmes.

Trials

At present, only one QoI treatment is permitted across the programme.

Fungicide performance trials (2018–2020) tested the product’s activity against septoria tritici, yellow rust and brown rust.

On septoria tritici, Univoq delivered a similar level of disease control to the leading SDHI/azole mixture (Revystar XE).

Both these products appeared more effective than other leading mixture combinations when compared at the same percentage of label dose. As with other products, higher application rates were needed when applied in curative, instead of protectant, situations.

On yellow rust, Univoq was more active than prothioconazole (in Proline275) alone, indicating that the fenpicoxamid component adds activity. It also provided a similar level of control to the azole epoxiconazole and the SDHI/azole mixture Elatus Era. 

On brown rust, Univoq also showed a higher level of activity than prothioconazole alone.

Comparisons with other mixture products indicated that Univoq performed similarly on brown rust to Ascra Xpro, providing very good levels of control when used at 50% label rate and higher.