EN
Fungal diseases can cause high yield losses in winter wheat cultures if chemical protection is not applied. A skilful application of fungicides should prevent those losses and assure profit for a producer. The aim of conducted work was to assess harmfulness of particular pathogenic fungi being causal disease agent, calculating costs of protection and their profitability. Protection costs were in average 235 PLN/ha. The effect of fungicidal action was the yield increase: 2006 – 7.55 dt/ha = 416 PLN, 2007 – 7.60 dt/ha = 627 PLN, 2008 – 5.68 dt/ha = 307 PLN and 2009 – 11.84 dt/ha = 568 PLN. Treatments with fungicides were cost-effective each year. Profitability was related to the amount of grain yield increase and its cost in a given year amounted to: 55 PLN/dt in 2006, 82 PLN/dt in 2007, 54 PLN/dt in 2008 and 48 PLN/dt in 2009. Profit for a producer was in average: 2006 – 195 PLN/ha, 2007 – 396 PLN/ha, 2008 – 82 PLN/ha and 2009 – 306 PLN/ha. In plant protection, it is useful for producer to councel monitoring and up-to-date recommendations Institute of Plant Protection – National Research Institute concerning the need of protection against the important agrophages.