Mendeli- ja CRE1-tüüpi rapsisortide resistentsus ristõieliste nuutri vastu Eesti põldudel
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Kuupäev
2026
Kättesaadavus
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Eesti Maaülikool; Maaelu Teadmuskeskus
Abstrakt
Clubroot pressure caused by Plasmodiophora brassicae is high across Estonian oilseed
rape fields, as confirmed by greenhouse biotests using 31 plant- and soil-derived field
populations. The susceptible control cultivar ‘Picard’ was heavily infected in nearly all
samples, indicating a high inoculum potential. Classical Mendel-type resistance (‘Cromat’)
was effective in only 26% of all cases and showed particularly poor performance
against plant-derived isolates (18%), demonstrating that this resistance type is largely
eroded under Estonian conditions.
Extended CRE1-type resistance (‘Credo’) provided a clear but incomplete advantage,
with resistant reactions in 48% of all samples. Its effectiveness was strongly influenced
by disease pressure: resistance was maintained in 71% of soil-derived populations but
dropped to 30% in plant-derived isolates, which were consistently more virulent. Compared
with German monitoring data, Estonian P. brassicae populations appear more
aggressive, suggesting either higher inoculum loads or a higher frequency of resistance-
breaking pathotypes.
For practical farming, these results underline that clubroot management in Estonia cannot
rely on cultivar resistance alone. On infested or high-risk fields, CRE1-type resistant
cultivars should be preferred, but only as part of an integrated management strategy
including extended crop rotation (≥4–5 years without brassicas), soil pH management
above 7.0, effective drainage, and strict machinery hygiene. Under high inoculum pressure,
even extended resistance may fail, making field history and preventive measures
decisive for sustainable oilseed rape production.
Kirjeldus
Märksõnad
Brassica napus, clubroot, Plasmodiophora brassicae, resistance, disease severity index, integrated management, crop rotation, plant health, articles
Viide
Annuk, T., & Loit, K. (2026). Mendeli- ja CRE1-tüüpi rapsisortide resistentsus ristõieliste nuutri vastu Eesti põldudel. Eesti Maaülikool; Maaelu Teadmuskeskus. https://doi.org/10.15159/AGR.26.14