The identification and characteristics of field resistance to lettuce downy mildew (Bremia lactucae Regel) |
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| Authors: | I R Crute Judith M Norwood |
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| Institution: | (1) National Vegetable Research Station, Wellesbourne, CV 35 9EF Warwick, UK |
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| Abstract: | Summary Eighty-one accessions of three Lactuca species which showed no recognisable race specific resistance to Bremia lactucae when tested in the laboratory as seedlings, exhibited different degrees of susceptibility when exposed to natural field infection. As a group, crisp genotypes had less mildew and a slower rate of disease development than other types of lettuce. Wild forms of Lactuca sativa and Lactuca serriola were particularly susceptible. In a further trial, the low field susceptibility of three lettuce cultivars (Iceberg, Batavia blonde de Paris and Grand Rapids) was confirmed. Disease development on cv. Iceberg was compared to that on the highly susceptible cv. Hilde in experiments where the two cultivars were grown either in close proximity or in isolation. The absolute level of attack on cv. Iceberg depended upon disease pressure and differences between the two types only became apparent approximately 8 wk after sowing. |
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| Keywords: | Lactuca sativa lettuce Bremia lactucae downy mildew field resistance |
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