Further Studies on the Relationship Between Cultural Characteristics and Pathogenicity in Ceratocystis ulmi

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Abstract
Cultural variability among C. ulmi isolates of known pathogenicity was studied. Four agar media were used, and radial growth, aerial mycelium production, formation of a striate radial growth pattern, and dry weight of mycelium production/cm2 of colony area were measured. The more aggressive isolates generally grew faster, produced a striate radial growth pattern, and produced less dry weight of mycelium/cm2 of colony area than less aggressive ones. Aerial mycelium production was associated with pathogenicity only on 2 of the media. Although some isolates within each pathogenicity type possessed combinations of cultural characteristics intermediate to those typical of either the more or less aggressive isolates, multivariate discriminant analyses on these cultural characteristics accurately classified the isolates in their respective pathogenicity types.