Phyto-examination of 8 batches of seeds was carried out by the biological method. The frequency of fungal pathogens occurrence was determined. Fusarium sp. and Rhizopus sp., most often present on seeds less Aspergillus sp., Penicillium sp. and Alternaria sp. In field experiments, the effect of presowing treatment of seeds with biological preparations Trichodermin-SC, Gliocladin-SC and Paurin on the reduction of Fusarium rot of sweet corn was determined. Biological products on a natural background increased the height of plants by 7,0–9,3%, the length of the corn cob by 4,9–9,2%, and the weight of the corn cob by 21,2–29,5%. On infectious background plant height was more on 9,8-10,9%, the length of the cob to 10,8-13,8%, the weight of the cob to 24,3-27,5%, compared to the control. The biological effectiveness of biological products on a natural background was 70,0-71,9%, on the infectious – 66,7-67,7%.