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Relationship between gene copies g−1 soil (determined by real-time qPCR) and disease severity index in field trials (DSIf) for (a) the susceptible Cultivar mix and (b) the clubroot-resistant cultivars cv. Mentor, cv. Alister, and cv. Archimedes, at all four field trial sites in 2017 and at Kumla in 2018. Note: log scale on x-axis.
