Correlation between Cultural Characters and Pathogenicity in Ceratocystis ulmi from Britain, Europe and America


Isolates of C. ulmi from Britain fall into two groups on the basis of cultural characters. Pathogenicity experiments show one group to be aggressive and the other to be non-aggressive. Some North American isolates resemble the aggressive isolates, while isolates from Northern Europe are non-aggressive. 
DOI: 10.1038/241381a0


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