Fig. 1.

Frequency (number of DH lines) distributions of phoma stem canker severity (G2 index) for lines in the BnaDYDH (Darmor-bzh × Yudal) mapping population in five winter oilseed rape field experiments: a INRA-Rennes, France, harvest year 1995; b INRA-Rennes, France, harvest year 1996; c INRA-Rennes, France, harvest year 2007; d Rothamsted, UK, harvest year 2008; e Rothamsted, UK, harvest year 2009). Arrows indicate the disease index for the mapping population parents (D Darmor-bzh, Y Yudal) and some of the elite cultivars (E Eurol, F Falcon, S Shogun) included as controls