| Summary: | The article presents the research data on the effect of Fusarium blight, Phoma rot, and Sclerotinia blight on the plant productivity of winter and spring rapeseed, brown mustard, and white mustard. As a result of studies, we found that Fusarium blight (the pathogens are fungi of the genus Fusarium Link) was the most harmful for the spring rapeseed, brown and white mustard – affection by it significantly decreased plant productivity. At 4 points of affection degree of plants, the harmfulness of the disease reached 71.2, 82.4, and 87.2 %, respectively. On winter rapeseed and mustard, plant productivity was considerably decreased by affection by Phoma rot in the form of a stem cancer (the pathogen is a fungus Leptosphaeria maculans (Desm.) Ces. et. De Not) and the stem form of Sclerotinia blight (the pathogen is a fungus Sclerotinia sclerotiorum (Lib.) De Bary.). The harmfulness of these diseases at 4 points of affection degree of plants reached 56.7 % and 66.7 % on rapeseed, and 56.6 % and 70.7 % on mustard, respectively.
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