Poland: Unfortunately, there are three new races of downy mildew in lettuce

Published 2023년 7월 4일

Tridge summary

The International Bremia Evaluation Board Europe (IBEB-EU) collected and compared over 350 Bremia isolates from lettuce produced in Europe in 2022 with isolates from 2021 and 2022. They found three virulence patterns that remained the same in 8%, 6%, and 16% of isolates. These isolates, known as Bl: 38EU, Bl: 39EU, and Bl: 40EU, were found in multiple countries across Europe. The Management Board emphasizes the importance of chemical control, hygiene measures, and fungicide use to prevent the development of new breeds of Bremia. Starting from July 1, 2023, commercial communications will no longer indicate resistance to Bremia lactucae Bl: 16-28EU, as they are almost no longer found in Europe.

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Original content

The International Bremia Evaluation Board Europe (IBEB-EU) collected over 350 Bremia isolates in lettuce produced in Europe in 2022 and compared them with 377 isolates found in 2022 and 2021. Bremia lactucae, the causative agent of downy mildew in lettuce, is genetically very changeable. Even in one field of lettuce production there can be several breeds. IBEB-EU representatives met in December 2022 in Paris to assess Bremia lactucae isolates collected in Europe in 2021 and 2022. Unfortunately, three virulence patterns were identical to the isolates. PT2036, FR9872 and ES10775 were found in 8%, 6% and 16% of isolates, respectively. The first two were found in 2021, while the last one appeared in 2022. Three new breeds of lettuce downy mildew PT2036: This isolate from Portugal is referred to as the new breed type Bl: 38EU. Bl: 38EU has been found many times, not only in Portugal, but also in France, the north of Spain, the southern part of Great Britain, Hungary, Switzerland and ...

Source: E-warzywnictwo