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The nature of virulence in isolates of Bremia lactucae from South Devon

The nature of virulence in isolates of Bremia lactucae from South Devon

Plant Pathology 34(1): 38-40

Nine isolates of B. lactucae [downey mildew] from South Devon showed the presence of virulence factors against all 11 resistance factors available in lettuce, but no insensitivity to metalaxyl. The virulence phenotype of a single-sporangium isolate of the fungus changed from V1, 3, 4 and 7 to 1, 2, 3, 4, 6 and 7 after it was maintained on Lobjoit Green Cos (RO) for 10 mo.

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Accession: 001489922

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DOI: 10.1111/j.1365-3059.1985.tb02757.x

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