Different Ratios of General:Specific Virulence Variance Among Isolates ofCylindrocladium crotalariaefrom Different Peanut Genotypes

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Abstract
C. crotalariae (145 isolates) were obtained from seedlings of 6 A. hypogaea genotypes grown in peanut-field soil. Resistant peanut cultivar NC 3033 and susceptible cultivar Florigiant were used as host differentials to compare isolate variability for virulence. There was a trend for general virulence for Cylindrocladium back rot to differ among groups of isolates from different genotypes. The overall root rot mean was highest for isolates from resistant ''NC 3033'' and lowest for isolates from susceptible ''NC 6''. Isolates obtained from resistant genotypes ''NC 3033'' and ''NC 18321'' had high variance for virulence specific to host differentials. Isolates from ''NC 3033'' and ''NC 18231'' had low and intermediate ratios of general:specific virulence variance, and these ratios were the 2 lowest among the 6 sources of isolates compared.