This paper presents the results of research into the health status of winter barley cultivated in two experiments with increasing doses of nitrogen fertilisation. Powdery mildew in cereals (Erysiphe graminis) affected the leaves and root-rot (fungi complex) –the stem base with the greatest intensity. The greatest intensity of diseases was observed in both experiments with the application of the highest dose of nitrogen and the lowest intensity of diseases – in a combination with no nitrogen fertilisation. It was shown that barley protection with Tilt 250 EC preparation reduced plant infection by leaf pathogens (Erysiphe graminis, Rhynchosporium secalis, Helminthosporium teres). The crop health status was also determined by the fertilisation method applied. Higher crop infections were observed in the combination with combined mineral and manure fertilisation than in the combination with mineral fertilisation only (especially by Erysiphe graminis, Helminthosporium teres, Pseudocercosporella herpotrichoides).

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