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Hear how Syngenta’s Eurofins 2023 trials have contributed to robust potato late blight resistance strategies

Blight – the greatest threat to potato crops

Potato late blight (Phytophthora infestans) continues to create the greatest challenge for potato growers and agronomists. Blight outbreaks can quickly devastate entire fields, leading to significant yield losses and widespread tuber blight infection.

Favoured by warmer and wetter conditions associated with climate change, issues have been getting progressively more difficult. Blight resistant potato varieties currently offer little or no respite. 

New Syngenta R&D for blight protection products and technical support ensures growers and agronomists are best placed to succeed in the fight against blight.

When dealing with blight-affected potato crops, 
it’s crucial to act quickly and decisively.

Adapting to the threat of new Blight strains in 2024

The ongoing evolution of new, more aggressive, blight strains poses ever greater threats to blight management strategies. 

Although not yet found in the UK, the development of EU_43, and now EU_46, in Europe has the potential to confer resistance to key CAA and OSBPI fungicides. 

UK growers and agronomists have been successful in tackling previous threats of fungicide resistance. Now, revised strategies, to mix modes of action and alternate chemistry within the Fungicide Resistance Action Committee (FRAC) guidelines, are required to protect crops and prevent the risk of new strains establishing.

Top tips for managing late blight in potatoes:

  1. Maintain mandipropramid, e.g. REVUS®, efficacy by mixing with a different mode of action* blight fungicide.
  2. Apply mandipropamid, or other CAA fungicides, preferably in a preventative manner.
  3. FRAC guidance states not to apply mandipropamid, or other CAA fungicides, in more than two consecutive applications. To further strengthen the CAA anti-resistance strategy, use mandipropamid in alternation with fungicides of a different mode of action.
  4. Up to six applications of CAA containing fungicides can be applied, making up no more than 50% of the intended total number of sprays.
  5. Good agricultural practices must be considered to reduce source of inoculum, disease pressure and resistance risk, e.g. consider planting resistant varieties and refer to disease prediction models.

*An effective partner for REVUS® is one that provides satisfactory disease control when used alone at the mixture rate.



Effective active ingredient mix partners for REVUS®

FRAC Group FRAC Group number Active ingredient mix partner Product example with active ingredient Comments and restrictions
Quinone outside inhibitor (QiI) 21 amisulbrom, cyazofamid Shinkon No more than 3 consecutive QiI products to be applied
Not more than 50% of intended programme
Carboxylic acid amides (CAA) 40 mandipropamid REVUS® No more than 2 consecutive sprays
Not more than 50% of intended programme
Resistance to EU_43_A1 (not found in UK)
Oxysterol binding protein inhibition (OSBPI) 49 oxathiapiprolin Zorvec Enicade Up to 3 applications
Not more than 20% of intended programme
Carbamates 28 propamocarb Raport Up to 6 applications
Benzamides 43 fluopicolide Not applicable Co-formulated with propamocarb
Maximum number of sprays is 4 at full dose
No more than three consecutive sprays
Quinone outside inhibitor (QoSI) 45 ametoctradin Enervin Up to 4 applications of any one product containing ametoctradin
No more than 3 consecutive sprays
Uncouplers of oxidative phosphorylation 29 fluazinam Shirlan Up to 10 applications
Resistance known within UK blight population e.g. EU_33_A2 & EU_37_A2
Cymoxanil 27 cymoxanil Sipcam C50 WG Up to 4 applications
If blight strains resistant to CAA chemistry are discovered in the UK through the Fight Against Blight programme, mixtures containing Cymoxanil must be combined with another effective active ingredient against late blight.
Should only be used in mix with another effective active ingredient against late blight.
Metalaxyl-M 4 metalaxyl-M FUBOL®Gold Up to 3 applications
Resistance – EU_13_A2
FUBOL®Gold contains mancozeb, see notes on withdrawal period in the box below.
Dithiocarbamates M03 mancozeb Manzate Up to 8 applications.
Withdrawal periods have been confirmed by DEFRA and approval of mancozeb expires 31st May 2024:
  • End of sale and supply by 30th November 2024
  • Storage, use and disposal by 30th November 2025

REVUS® IS A TRUSTED LATE BLIGHT FUNGICIDE THAT HAS CONSISTENT PERFORMANCE, NEW GROWTH PROTECTION AND EXCELLENT RAINFASTNESS

Season long protection with REVUS® compared with untreated (Eurofins 2021)

APPLICATION GUIDANCE

  • REVUS® is to be applied in mixtures with a fungicide of a different mode of action*.
  • Apply REVUS®, or other CAA fungicides, preferably in a preventative manner.
  • FRAC guidance states not to apply REVUS®, or other CAA fungicides, in more than 2 consecutive applications. To further strengthen the CAA anti-resistance strategy, Syngenta UK would advocate the use of REVUS® in alternation with fungicides of adifferent mode of action.
  • Up to 6 applications of CAA fungicides, making up no more than 50% of the intended total number of sprays.
  • Good agricultural practices must be considered to reduce source of inoculum, disease pressure and resistance risk, e.g. consider planting resistant varieties and refer to disease prediction models.
  • An effective partner for REVUS® is one that provides satisfactory disease control when used alone at the mixture rate.
  • The drift retardants Crusade, Sterling, LOK-IT and Vigilant are supported with the use of REVUS®.

REVUS® IS A TRUSTED LATE BLIGHT FUNGICIDE THAT HAS CONSISTENT PERFORMANCE, NEW GROWTH PROTECTION AND EXCELLENT RAINFASTNESS

REVUS® SUMMARY ON POTATOES

Active mandipropamid 250 g/l
Formulation suspension concentrate (SC)
Maximum individual dose 0.6 l/ha
Maximum no. of treatments 4 per crop
Latest time of application 3 days before harvest
Varieties REVUS® can be used on all varieties, including seed crops
Resistance management FRAC guidelines must be followed

Download a PDF version

EVAGIO® FORTE, THE NEW MANDIPROPAMID AND AMISULBROM FORMULATION PROVIDING EXCELLENT LEAF AND TUBER BLIGHT CONTROL

BOTH REVUS® AND EVAGIO® FORTE GIVE EXCELLENT FOLIAR BLIGHT CONTROL!

APPLICATION GUIDANCE

  • Mandipropamid is to be applied in mixtures with a fungicide of a different mode of action.
  • Apply mandipropamid, or other CAA fungicides, preferably in a preventative manner.
  • FRAC guidance states not to apply mandipropamid, or other CAA fungicides, in more than 2 consecutive applications. To further strengthen the CAA anti-resistance strategy, Syngenta UK would advocate the use of mandipropamid in alternation with fungicides of a different mode of action.
  • Up to 6 applications of CAA containing fungicides can be applied, making up no more than 50% of the intended total number of sprays.
  • Good agricultural practices must be considered to reduce source of inoculum, disease pressure and resistance risk, e.g. consider planting resistant varieties and refer to disease prediction models.
  • The drift retardants Crusade, Sterling, LOK-IT and Vigilant are supported with the use of EVAGIO® Forte.

EVAGIO® FORTE – SUPERIOR PROTECTION FROM TIP TO TUBER

The potency of mandipropamid against foliar blight helps to limit the sources of tuber blight infection. However, in combination with amisulbrom, which directly inhibits both the mobility and germination of zoospores, it stops the sources of tuber blight.

EVAGIO® FORTE SUMMARY ON POTATOES

Actives amisulbrom 100 g/l + mandipropamid 200 g/l
Formulation Suspension concentrate (SC)
Maximum individual dose 0.6 l/ha
Maximum number of treatments 3 per crop
Latest time of application 7 days before harvest
Varieties EVAGIO®Forte can be used on all varieties, including seed crops
Resistance management FRAC guidelines must be followed FRAC Recommendations

Download a PDF version

Blight forecasting

Syngenta’s industry leading BlightCast gives growers and agronomists up to 15 days advanced warning of conditions conducive to blight disease infection and development. This invaluable time window allows for proactive measures to fine tune blight protection strategies.

Access BlightCast for free as part of the Syngenta MyField app, with a section specifically dedicated to potato and sugar beet growers.

Download the free myFIELD app

Stay informed, stay prepared, and stay ahead with BlightCast, Syngenta's industry-leading forecasting tool!



FAQ

Strengthen Blight Protection With ICM

A robust fungicide strategy is the cornerstone of protection against blight. Developing an integrated crop management (ICM) approach adds greater reliability and resilience.

By utilising a full range of cultural practices and improving plant health, it also provides further protection of existing chemistry against evolving blight strains. 

Application On Target Every Time

Syngenta application technology has revolutionised potato crop treatments, ensuring accurate coverage to enhance performance of every application.

Our exciting new R&D has clearly demonstrated the Syngenta 3D ninety nozzle gives the optimum results for all blight and foliar applications in potatoes, to deliver every product in the right place, at the right time.

Supporting Fight Against Blight

Syngenta is proud to continue our ongoing sponsorship of the Fight Against Blight programme, managed by the James Hutton Institute.

Monitoring blight populations and analysing the genetic make-up of any disease outbreaks is crucial for effective product selection and future control strategies.