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Plasmodiophora brassicae is a Plasmodiophorid and obligate biotrophic protist in the eukaryotic kingdom of Rhizaria. It causes clubroot disease of cruciferous crops by producing resting spores that can survive in the soil for more than ten years. Although up to date there is no effective chemical control but now a strain of the bacterium Bacillus subtilis XF-1, isolated from China, has been...
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