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VAŇOVA M., MATU SINSKÝ P., BENADA J. (2006): Survey of incidence of bunts (Tilletia caries and Tilletia controversa) in the Czech Republic and susceptibility of winter wheat cultivars. Plant Protect. Sci., 42: 21–25. Bunts (caused by Tilletia caries and T. controversa) belong to very important diseases of winter wheat because contaminated commodities (seeds, foods and feeds) affect the marketability of the crop on both domestic and export markets. They can be relatively easily controlled by chemical seed treatments. Due to the availability of effective chemical control, the reaction of wheat cultivars to bunts has so far not been an important trait for plant breeders in some areas of the world. However, if synthetic chemicals are not allowed, like in organic farming, untreated seed may quickly lead to a build-up of bunt to levels that render the crop unmarketable. The use of wheat cultivars partially or fully resistant to bunts could greatly contribute to ease the bunt problem. The reac tion of winter wheat cultivars was evaluated in field tests. Seeds of winter wheat were inoculated with teliospores of T. caries. The reaction to T. controversa was studied under heavy natural infestation with spores in the soil. With T. caries, the heaviest infection was found in cvs Drifter and Ebi, while cvs Nela, Brea and Samanta had the lowest. The average level of infection with T. controversa was higher than that of T. caries. The cvs Niagara, Brea and Versailles had significantly lower numbers of bunt ears of T. controversa in 2002. The incidence of both bunts in grain samples that had not been cleaned and sorted after harvest was monitored for 4 years. A total of 1 058 samples collected from various locations in the Czech Republic were analysed for the presence of bunt spores and the species determined. The investigation demonstrated a rather widespread occurrence of bunts across the Czech Republic, with T. controversa being more frequent.