Abstract
From 2011 to 2012,4 identification hosts in Williams system(two types of Brassica napus L.Laurentian.,Wilhelmsburger and two types of Brassica oleracea L.Jersey Queen.,Badger Shipper.,) were used to identify the physiological races of pathogens causing club root in 11 regions of Heilongjiang,Jilin and Liaoning provinces where club root diseases of Chinese cabbage were mainly occurred.The result indicated that all strains of pathogens from the 11 regions were race 4.
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