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Abstract
Asparagus officinalis L. accessions were screened for resistance to Stemphylium leaf spot under controlled environmental conditions. The plants were inoculated with a conidial suspension of two isolates of Stemphylium sp. from asparagus. Disease severity assessments, based on percentage stem area necrosis (% SAN), were made 13—17 days after inoculation. Estimates of mean % SAN ranged from 31 to 74%. None of the accessions showed outstanding levels of resistance, but significant differences were observed in disease susceptibility between accessions. The accessions also differed for within-accession variability. Selection for increased levels of resistance is likely to be most effective in accessions with high within-accession variance values.