NVWA finds wart disease on 8 agricultural plots in the north-eastern part of the Netherlands | News report

News item | 25-11-2022 | 15:28

The Dutch Food and Consumer Safety Authority (NVWA) will have wart disease caused by the fungus 8 times by 2022 Synhytrium endobiotic, established in potato cultivation. It concerned 8 agricultural plots belonging to 7 growers in the north-east of the Netherlands, where inspectors from the Dutch General Inspection Service (NAK) and NVWA found symptoms of wart disease. This is a high number of finds for the Netherlands.

Every year, inspections are carried out by NVWA and (on behalf of NVWA) by NAK to determine whether wart disease occurs in Dutch potato cultivation. In the event of a discovery, action is then taken by NVWA. For all parcels that are found to be infected, NVWA places a cultivation ban on the cultivation of potatoes and propagating material for a period of at least 20 years, with the aim of eradicating the fungus from the soil in question. The examinations for wart diseases and the measures in case of findings are carried out in accordance with implementing regulation (EU) 2022/1195.

Picture: ©NVWA

Development of wart disease findings within the last 3 years

In 2020, NVWA diagnosed wart disease on 3 plots in Stadskanaal municipality. The cause of these infections turned out to be a new pathotype (physio) for the Netherlands: pathotype 38 (Nevşehir). In 2021, wart disease was diagnosed on 4 plots. In the municipality of Westerwolde, 2 plots were found infected with pathotype 38. In the municipality of Veendam, 1 plot where wart disease was detected on the variety Altus was found to be infected with pathotype 18. The pathotype of a very light contamination on a plot in the municipality of Emmen has not yet could be determined.

To gain a better insight into the possible presence of pathotype 38, the NVWA conducted the wart disease survey in 2022 in areas surrounding the infections detected in 2020 and 2021. Almost all 90 inspections in this area were carried out within a 10 kilometer radius around this infected area. NAK randomly took 350 potato samples throughout the starch potato area for research into the possible presence of brown and ring rot. In addition, special attention was paid to symptoms of wart disease.

8 new infections this year

The inspections in the north-eastern part of the Netherlands were completed in the first half of November. These have led to 8 new plots declared infected with wart disease: 2 in the municipality of Westerwolde, 2 in the municipality of Stadskanaal, 2 in the municipality of Midden Groningen, 1 in the municipality of Pekela and 1 in the municipality of Emmen. The varieties where the infections were found are Altus, Avarna, Festien, Saprodi, Seresta and Supporter. Based on the resistance profiles of these varieties, it is tentatively expected that the majority of findings in 2022 will be caused by infections with pathotype 38. To establish this with certainty, the NVWA is determining the pathotype. The exact pathotypes of the latest findings are expected to be known in June 2023. These results provide more insight into the distribution of pathotype 38 within the starch potato area.

The sector, NVWA and research institutes are working on an action plan to bring Physio 38 under control, including making sufficiently resistant potato varieties available quickly.

Results resistance study pathotype 38

In 2022, 50 potato varieties will be tested for resistance to pathotype (physio) 38. This official study consisted of 2 consecutive laboratory tests.

The results of this can be found on the NVWA website.

Starting this year, new material from potato growers can also be tested for resistance to this pathotype.

The availability of potato varieties with high resistance (score 9 or 10) to pathotype 38 is of great importance for effective control and containment.

More information

For questions about this news, journalists can contact NVWA’s press team, telephone number (088) 22 33 700.

Consumers and businesses can contact the Customer Contact Center or 0900-03 88 (usual call costs).

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