Maximise Mandipropamid For Blight Management

25 April 2025, UK: After two successive seasons of high and prolonged blight pressure, the more aggressive blight strains and risk of resistance developing should be top of mind for potato growers and agronomists this summer, warns Syngenta Technical Manager, Andy Cunningham.

“That has been further compounded by the range of blight strains that now make up populations in the UK, some of which create a real challenge for putting together highly effective blight control programmes,” he reports.

Crucially, the limited resistance identified to CAA mandipropamid is a recessive gene, so if that is diluted in anyway with new gene evolution, then it will remain susceptible to the fungicide group – as has been seen with EU_46 that is sensitive to Revus.

“Mandipropamid, in Revus, is one of the most potent actives on the toolbox, outside of OXTP. Being able to utilise its strength is extremely important for robust blight programmes,” he advocates.

Powerful partners for Revus mix options 2025:

• Propamocarb
• Amisulbrom
• Fluazinam
• Cyazofamid
• Mancozeb

Syngenta Potato Power research in the UK and across Europe has been focused on developing mixing strategies proven to work on managing blight strains with reduced sensitivity to CAA mandipropamid products, along with minimising the risk of other strains developing resistance. 

In the UK at Euroblight trials, for example, Andy reported combinations of Revus and fluazinam performed exceptionally well, with significantly improved control over straight fluazinam.

The research, using programmes and combinations, showed that a full complement of six mandipropamid mix applications, strictly alternated in a 12-spray programme to meet FRAC guidelines, achieved the highest levels of blight control. 

A blight programme with no mandipropamid did achieve 75% control compared to untreated, but with a 22% improvement over that from including two Revus treatments, and a further 29% enhancement with the six mandipropamid application programme. 

“The visual effects of blight suppression and the greenness of the crop protected with more mandipropamid in the programme was clear to see,” he adds.

Trials in Denmark, in the presence of both EU_43 and EU_46 also demonstrated the importance of using Revus in mix with other actives to continue to retain very high levels of foliar control – even where the same mix was used right through the season in the trial scenario. In combination with amisulbrom (Evagio Forte), for example, infection was down at 10%, compared to over 66% in untreated.

“Fluazinam, is a really good partner for Revus, where the synergy works exceptionally well together to effectively eliminate the problems,” advises Andy. 

Plots where different combinations were used through the season, including four Revus mixes in the programme, completely prevented any infection.

Propamocarb has also been picked out as an exceptional partner with Revus, along with cyazofamid and mancozeb. The combination of Revus and amisulbrom is most applicable after flowering, to add tuber blight protection to the mix. 

Syngenta advice for 2025 season blight control

• Always apply Revus in mixture with a fungicide with a different mode of action.
• Apply Revus, or other CAA fungicide, in strict alternation with a fungicide with a different mode of action. 
• Preferably apply Revus or other CAA fungicides as preventative treatments.
• Use up to six applications of mandipropamid, or other CAA fungicide, making up no more than 50% of the intended number of sprays. 
• Good mix protectant partners for Revus include: fluazinam; propamocarb; amisulbrom; cyazofamid and mancozeb.     

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