Summary: Correlation and regression analyses were carried out between the virulence (expressed as growth rate in apple fruits) and the secretion of three host wall-degrading enzymes by 119 isolates of , most of which had been obtained following exposure of conidia to -methyl--nitro--nitroso-guanidine. Virulence was found to be significantly correlated ( < 0.01) with α-L-arabinofuranosidase, but not with pectin esterase or, where enzyme inter-dependence had been statistically eliminated, with polygalacturonase. Approximtely 35% of the total variability in virulence could be accounted for in terms of the three enzymes.


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