Significant changes to the HGCA Recommended List for winter oilseed rape see 2009/10 with separate lists for two regions - the east and west, and the north. Also included for the first time are semi-dwarf varieties. Explaining the reasoning behind theseparate lists RL manager Jim McVittie pointed out that only about 10% of the UK crop was grown in the north - roughly beyond Scotch Corner. "To do well in that region you've got to have light leaf spot resistance," says Dr McVittie. "Stem canker resistance is immaterial." In most of the east and west region, effectively south of Scotch Corner, stem canker is the most important disease with light leaf spot much less of a problem.
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