Resistance to Leptosphaeria maculans In Brassica napus (oilseed rape) leaves (phoma spot) and stems (canker)

摘要

The number of phoma leaf spot lesions formed in controlled environment experiments 8-21 days post inoculation with ascospores of Leptosphaeria maculans was consistently greater on winter oilseed rape cv. Darmor than on cv. Eurol. Similarly in winter oilseed rape field experiments in the 2003-2004 (Dec-Mar) and 2004-2005 (Oct-Dec) growing seasons cv. Darmor often had more lesions than cv. Eurol, but later in both seasons Eurol had more leaf lesions than Darmor. Eurol also developed more severe phoma stem cankers than Darmor at the end of both seasons. There was no difference in leaf size or leaf number between cultivars. No avirulence genes corresponding to resistance genes in these cultivars have been found in UK L. maculans populations.