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Effect of oilseed rape rotation (A) and soil pH (B) on the incidence of clubroot (%) in 25 Plasmodiophora brassicae infested fields in Poland (2016–2020). (A) Box–whisker plots with medians (middle line), mean-value (×), 25% and 75% quartiles, and minimum and maximum values; (B) Spearman’s rank correlation coefficient.
