Yurub: EU_36 Late Blight Clone wuxuu hoos ugu dhacaa 34% muunado ahaan marka loo eego EU_43 oo iska caabisa 12%
Wadooyinka muhiimka ah ee la qaado
- 34% of early 2025 EU samples were EU_36_A2, down from 52%
- 12% share of resistant EU_43_A1 in 2025, up from 9% in 2024
- 25% of French late blight samples were EU_43 in early 2025
- 20% of British samples in 2025 were EU_46_A1 (OSBPI issue)
Maxay muhiim u tahay?
- Beeralayda
- Ask your advisor for local EuroBlight genotype data; avoid relying on CAA or OSBPI products alone where EU_43 or EU_46 are present.
- Loogu talagalay processor-rada
- Discuss blight strategies with contract growers in France and the Netherlands, where EU_43 reached 20-25% of samples.
- Alaab-qeybiyeyaasha
- Prepare programmes with alternative modes of action for France, the Netherlands and Great Britain, where resistant clones are most common.
Soo koobid 60-ilbiriqsi ah
Late blight in Europe is shifting toward clones that resist key fungicide groups. The early EuroBlight release for 2025 shows the long-dominant EU_36 lineage dropping to about a third of samples, while EU_43, which tolerates both CAA products such as mandipropamid and the OSBPI active oxathiapiprolin, climbed to 12%. France and the Netherlands show the highest EU_43 shares at 25% and 20%. A newer clone, EU_46, which is insensitive to oxathiapiprolin but still controlled by CAA chemistry, reached a fifth of British samples. FRAG-UK guidance backs these resistance profiles and stresses staying within label limits. Growers and agronomists therefore need local genotype data before building spray programmes, and suppliers should expect demand for alternative modes of action. Caveat: 2025 was a low-pressure season, and sample numbers in the Netherlands, Germany and Belgium were small.
The late blight population in Europe is changing again. EuroBlight early data for 2025 show that genotype EU_36_A2 made up 34% of all early samples. In 2024 it was 52%. The fungicide-resistant genotype EU_43_A1 rose from 9% to 12%.
The EuroBlight network of European scientists monitors Phytophthora infestans. Its early 2025 release, dated 15 December 2025, covers about 1,250 results. Blight pressure was low in 2025. Only 166 samples came from the Netherlands, Germany and Belgium, against more than 1,000 in 2024.
Where EU_43 is spreading
The share of EU_43 differs by country. It reached 25% in France (n=345) and 20% in the Netherlands (n=69). It was 13% in Belgium, 12% in Germany and 4% in Denmark. Another clone, EU_46_A1, rose from 4% to 7% of all samples. In Great Britain it formed 20% of 278 samples.
Maalmaha shaqada. Ka bax rukunka hal guji.
The final 2024 data, released on 28 May 2025, give the longer view. Teams in 27 countries genotyped 2,914 samples. EU_43 fell from 23% in 2023 to 9% in 2024. The EuroBlight database now holds more than 21,000 samples from 37 countries for 2013–2024.
What resistance means in practice
EU_43 is resistant to mandipropamid and other CAA fungicides. It also shows resistance to the OSBPI fungicide oxathiapiprolin, according to EuroBlight. The UK Fungicide Resistance Action Group (FRAG-UK) confirms this profile. Its June 2025 guidelines say the strain emerged in Denmark in 2018 and spread into northern continental Europe.
EU_46_A1 has a different profile. All strains found in Great Britain so far are insensitive to oxathiapiprolin but sensitive to CAA fungicides, FRAG-UK says. EU_36_A2 is still the dominant clone in Great Britain and Northern Ireland. FRAG-UK reports no documented fungicide resistance for it. EuroBlight notes a low frequency of EU_36 samples resistant to oxathiapiprolin.
Maxay muhiim u tahay?
Two important modes of action are now under pressure in parts of Europe: CAA and OSBPI. Growers in France, the Netherlands and Great Britain see the highest shares of the problem clones. Spray programmes that rely on one of these groups alone carry growing risk.
FRAG-UK advises never to exceed label limits for the number of applications. Knowing which clones are present locally is essential before choosing products. The 2026 EuroBlight data will show whether EU_43 and EU_46 keep gaining ground.
Kahortagga iyo xakamaynta · Qoraal tifaftire
Nabarro dambe (Phytophthora infestans): waxa beeralaydu sameyn karaan
- Ka Hortagga: plant healthy seed, remove cull piles and volunteer plants, and choose less susceptible varieties.
- Korjoogteynta: follow a local blight warning system and send samples for genotyping when control fails.
- Chemical protection in Europe: fluazinam (FRAC 29), cyazofamid (FRAC 21), propamocarb (FRAC 28), cymoxanil (FRAC 27), copper (FRAC M1) — check the national register of your country.
- Maareynta iska caabbinta: alternate or mix FRAC groups. Use phenylamides (FRAC 4) only preventively and in a mixture. EU_43_A1 is resistant to FRAC group 40.
Qoraalkan waxaa bixiya kooxda tifaftirka potatoes.news si ay u helaan macluumaad oo keliya. Ma aha talo soo jeedin shirkad kasta mana aha mid khasab ah. Isticmaal oo keliya alaabada ilaalinta dhirta ee waddankaaga laga oggolaaday oo raac calaamadda. Magacyada alaabta iyo diiwaangelinta way kala duwan yihiin waddamada; la tasho khabiir ku takhasusay beeraha maxalliga ah.
Photo: Late blight on a potato plant (illustrative). Björn Andersson (SLU) / Wikimedia Commons, CC BY-SA 4.0
Warbixin Kooban oo ku saabsan Baradhada Caalamiga ah
Shanta sheeko ee ugu sarreeya, qiimaha, digniinaha cudurrada iyo dhacdooyinka. Subaxyada maalmaha shaqada, xayeysiis la'aan.
Maxaa xigaya
Final 2025 data and the 2026 season results will show whether EU_43 and EU_46 continue to spread. FRAG-UK updates its guidance as new resistance data arrive.
Ilaha
- EuroBlight early data release 2025 (Aarhus University) — https://agro.au.dk/forskning/internationale-platforme/euroblight/currently/news/nyhed/artikel/euroblight-early-data-release-2025
- EuroBlight final data release 2024 — https://agro.au.dk/forskning/internationale-platforme/euroblight/currently/news/nyhed/artikel/euroblight-final-data-release-2024
- FRAG-UK Potato Late Blight Guidelines, June 2025 (AHDB) — https://projectblue.blob.core.windows.net/media/Default/ImportedPublicationDocs/AHDBCereals&Oilseeds/Disease/FRAG/FRAG-UKPotatoLateBlightGuidelines(June2025).pdf
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