Early Screening of Elms for Resistance toCeratocystis ulmi

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Abstract
The repeatability of an early screening technique to evaluate resistance to C. ulmi, the cause of Dutch elm disease, was tested with selected elm clones in their 1st year of growth. In controlled-environment chambers, significant differences among elm clones, incubation temperatures, and fungus strains were detected. American and English elms and the cultivar Belgica showed low levels of resistance; the cultivars Groeneveld, Dodoens, Lobel and Plantyn showed moderate resistance; and the cultivars Regal, Christine Buisman and Sapporo Autumn Gold showed high resistence. Aggressive and nonaggressive strains of C. ulmi were clearly differentiated by the range of clones and incubation temperatures employed.