EN
Reduced tillage systems in cereals may lead both to increasing weed infestation and a strong weed competition for living space and nutrients in the soil. As a consequence, this may favour the development of pathogenic fungi such as Fusarium spp. and generate a second contamination of grain with the fungies toxic metabolites. The aim of performed research was to determine the effect of weed infestation level in ploughless crop on the occurrence of diseases caused by Fusarium spp. on two winter rye cultivars, as well as laboratory analyses for mycotoxin detection in grain: deoxynivalenol and nivaleniol. As the result of poar efficacy of the herbicide Glean 75 WG (applied in the autumm) in controlling the weed species Apera spica-venti and Centaurea cyanus, and the infection winter rye grain cv. Dańkowskie Złote by Fusarium spp. an increased level of deoxynivalenol (0.08) was detected as compared both to the control object and herbicide protected object with Atlantis 040 WG + Actirob 842 EC.