The dominant pathogenic fungi on winter wheat in 1999-2001

The research works were carried out at the Agricultural Experimental Station of Agricultural University in Chylice, Mazowieckie voivodship. Diseases, their causal agents and occurrence on winter wheat cv. Kobra and cv. Mikon were studied in 1999-2001. Observations were performed in field conditions, on plots treated with fungicides and untreated control plots. Studies were concetrated on the most important pathogenic fungi occurring on winter wheat leaves, ears and stem bases, especiaIly Puccinia recondita on leaves (45% of infected leaf area), Stagonospora nodorum on ears (24% of infected ear area), Mollisia (Tapesia) yallundae (infection index 29) and Fusarium spp. (54% of infection culms) on stem bases. It has been proved that susceptibility to same diseases is strongly connected with cultivar and weather conditions. Average grain yield losses during three years period of study amounted: 1999 - 21,68%, 2000 - 7,34% and 2001 - 53,15% respectively