Winter wheat cv. Zyta was grown in organic and integrated farming systems as part of a field experiment conducted in north-eastern Poland in 2008-2010. The aim of the study was the assessment of the effect of different farming systems and various protective treatments on plant health status. The severity of infections caused by Septoria spp., Blumeria graminis and Puccinia recondite, affecting the leaves of winter wheat plants, was determined mainly by weather conditions and the applied cultivation system. 2009 was a rainy year which supported the development of Septoria diseases, whereas the dry year 2010 was favourable for the growth of powdery mildew of grasses and cereals. The leaves of winter wheat plants grown in the organic farming system were more often infected with brown rust, whereas plants grown in two variants of the integrated farming system were more likely to be affected by Septoria diseases and powdery mildew. The severity of stem-base diseases varied depending on the year of the study and the applied forecrop. The highest infection rates were reported when winter wheat was grown as a forecrop. The rainy year 2009 stimulated the development of stem-base diseases. The positive effect of EM biopreparation on the health status of winter wheat was observed only in the organic farming system.

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