Evaluation of the effectiveness of fungicides in suppression Alternaria blight and Pho-ma rot on spring rapeseed

The purpose of the research is to determine the biological and economic effectiveness of fungicides of various chemical groups against necrotrophic pathogens Phoma lingam (Tode) Desm. and Alternaria sp. on spring rapeseed crops in the south of the Non-Chernozem zone. A significant effect in curbing the development and prevalence of these diseases was after the application of fungicides Spirit, SK (azoxystrobin 240 g/l + epoxiconazole 160 g/l) at a rate of 0.7 l/ha and Kolosal Pro (propiconazole 300 g/l) + tebuconazole 200 g/ha) at a rate of 0.5 l/ha with double treatment of spring rape crops in the phase of formation of a rosette of leaves - transition to stem formation (BBCH-25-30) and in the flowering phase of the harvest (BBCH-63-65). The decrease in the prevalence of Alternaria blight by the yellow-green bean phase in these variants ranged from 64 to 65%rel, in development – from 73 to 75%rel, the prevalence of Phoma rot – from 62 to 67%rel, in development from 68 to 79%rel accordingly to the control variant. The greatest economic efficiency was after double treatment of rapeseed with Kolosal Pro - 47% (2,83 t/ha).