Abstract
Infection by Leptosphaeria maculans, which causes blackleg of rape (Brassica napus var. napus), was detected before symptoms developed in the field. When crop plants were transferred to pots and incubated in a heated glasshouse, infected plants developed stem lesions, indicating how much infection had occurred between germination and sampling. Potted bait plants placed in the crop for 1 week and then incubated showed that infection occurred as early as 5 weeks after sowing, and was still occurring after 13 weeks. Application of the fungicide benomyl, 8 weeks after sowing, significantly reduced the proportion of plants with stem lesions. The reduction was greater for cv. Marnoo than for cv. Tower. A second application, 11 weeks after sowing, had no additional effect. Similar numbers of leaf lesions occurred on the two cultivars, but fewer Marnoo plants developed stem lesions and died. Selection of new resistant cultivars should be based on the incidence of both stem and leaf lesions.
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