Kartuli-lehemädaniku tekitaja virulentsus ja patotüüpide koosseis Eesti kartulipõldudel
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Kuupäev
2026
Kättesaadavus
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Eesti Maaülikool; Maaelu Teadmuskeskus
Abstrakt
Over the past seven growing seasons (2018–2024), weather conditions in Estonia have
been unfavourable for the development and spread of potato late blight pathogen Phytophthora
infestans. This may have created a misleading perception of the potential impact
of this destructive disease. However, as late blight remains a major threat to potato
production and pathogen populations are continuously evolving, ongoing monitoring of
pathogen distribution and population variability is necessary.
The aim of this study was to monitor the frequency of virulence factors (R1−R11) and
race composition and possible temporal changes in P. infestans populations across three
different production systems (breeding/screening, conventional and organic fields)
based on isolates collected from Estonian potato fields over a period a five-year period.
All 11 virulence factors were detected among the collected isolates. The majority of isolates
were virulent against genotypes R1, R3, R4, R7, R10, and R11. Virulence frequency
was low against differential factors R9 (9%) and R5 (15%) and relatively low against
R8 (26%) and R6 (32%). Significant variation in the occurrence of virulence factors was
observed for R5, R6, and R8, however, a clear temporal increase was observed only for
R2, whose frequency increased significantly from 35% in 2010 to 77% in 2014. In the
comparison among production systems, the greatest difference was observed for virulence
factors R2 and R6; with higher occurrence in breeding/screening fields (R2 86%
and R6 49%) than in conventional and organic production fields. The five most common
pathotypes were 1.2.3.4.7.10.11, 1.3.4.7.10.11, 1.2.3.4.6.7.10.11, 1.2.3.4.5.6.7.8.10.11,
and 1.2.3.4.7.8.10.11, accounting for 42% of all isolates. The occurrence of moderately
complex (5–7 virulence factors) and highly complex (8 or more virulence factors) races
varied between years, but remained constantly high throughout the study period. The
proportion of complete pathotype was also high in all production systems, while isolates
with 8 or more virulence factors were most prevalent in breeding/screening fields
(54%). The abundance of unique pathogen types was high (66%), varying between
61–80% across years and 63–70% across production systems, with the highest abundance
in isolated from organic fields.
The presence of highly virulent races in Estonian population indicates a regional threat
and suggests a critical need to adjust disease management approaches, emphasising the
development of novel approaches to sustainable late blight control in Estonian potato
production.
Kirjeldus
Märksõnad
R genes, potato late blight, virulence factors, race diversity, plant health, articles
Viide
Runno-Paurson, E., Agho, C. A., & Niinemets, Ü. (2026). Kartuli-lehemädaniku tekitaja virulentsus ja patotüüpide koosseis Eesti kartulipõldudel. Eesti Maaülikool; Maaelu Teadmuskeskus. https://doi.org/10.15159/AGR.26.17