Abstract
SUMMARY: Fusarium nivale and F. culmorum were frequently found in association with damaged perennial ryegrass.In glasshouse experiments using sterilized soil the pathogenicity of F. nivale isolates varied greatly, but those which were pathogenic reduced seedling emergence and damaged established young plants.All the F. culmorum isolates tested significantly reduced the emergence of S321 perennial ryegrass seedlings, but none had any effect on the growth of established seedlings.Combined inoculations with both Fusarium species further reduced seedling emergence but resulted in less damage to established seedlings than was obtained with F. nivale alone.

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