The study was conducted in 2007–2009. Winter rape, spring rape, white mustard, Chinese mustard and winter wheat were grown as previous crop for winter wheat cv. Olivin. Wheat was grown under the conventional and intensive technology with full fungicidal protection and increased nitrogen rates (from 210 to 270 kg/ha depending on the previous crop). The infection rates of leaf blotch varied widely from 30.5% (after winter wheat) to 54.2% (after winter rape). Higher level of nitrogen fertilization in the intensive wheat farming system contributed to a higher incidence of leaf diseases, but fungicide application reduced their severity.