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Resistance to Black rot was studied in  B. oleracea, B. campestris  and  B. napus,  using three different inoculation procedures. The results indicated that hydathode inoculation without wounding and the wound suspension technique were useful for differentiating levels of resistance found in  B. oleracea  and  B. campestris,  but not in  B. napus.  Only the wound colony method allowed differentiation between high and moderate resistance in  B napus. B. napus,  PI 199947 and PI 199949, exhibited the highest resistance found in cultivated Brassica species. In  B. campestris,  two chinese cabbage accessions showed quantitative inheritance for moderate levels of resistance. In  B. napus,  the high level of reistance was conferred by one dominant gene, to which the symbol Br was assigned, whereas the moderate resistance was due to one recessive gene bm.

New Sources of Resistance to Black rot in Crucifers and Inheritance of Resistance.