Further characterization of field resistance in lettuce to Bremia lactucae (downy mildew)

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Abstract
The development of five Bremia lactucae isolates on the field‐resistant crisphead lettuce cultivar Iceberg was compared under field conditions with that on the more susceptible crisphead cultivar Ithaca. With each of five isolates, the epidemic developed more rapidly on Ithaca than Iceberg; lesions on Ithaca were more numerous, larger and sporulated more profusely than on Iceberg. There was no evidence for adaptation of isolates to Iceberg, which provides some additional evidence that the resistance of this cultivar could be non‐differential (horizontal). There was, however, evidence of non‐specific differences between isolates in their quantitative virulence.

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