Two common fungicides: Vial TrasT (60 g/l tebuconazole and 80 g/l thiabendazole) and Oplot (90 g/l difenoconazole and 45 g/l tebuconazole) were tested for effectiveness against seed-borne toxigenic fungi Fusarium spp. and Alternaria spp. using naturally infected wheat (Triricum aestivum L., cultivar Novosibirskaya-14) seeds collected from the field located near Krasnoyarsk, Russia. Treatment with Oplot statistically significantly reduced Fusarium infection by 10 percentage points (from 31.4% to 21.4%) and statistically significantly reduced Alternaria infection by 25.8 percentage points (from 42.9% to 17.1%). Treatment with Vial TrasT demonstrated no statistically significant effect in reducing infection both for Fusarium and Alternaria. The results demonstrates that populations of Fusarium spp. and Alternaria spp. in Middle Siberia have developed resistance to tebuconazole and thiabendazole, but not to difenoconazole.

Nine varieties of soft spring wheat (Altayskaya 70, Altayskaya 75, Krasnoyarskaya 12, Novosibirskaya 15, Novosibirskaya 16, Novosibirskaya 29, Novosibirskaya 31, Novosibirskaya 41 and Svirel) were studied in the field experiment using fallow as a predecessor and wheat as a predecessor both with and without nitrogen fertilizer for an incidence of root infection caused by Fusarium spp., Alternaria spp. and Bipolaris sorokiniana. Average by varieties and variants of experiment incidence of Fusarium spp., Alternaria spp. and B. sorokiniana was 7.5, 5.7 and 10.8%, respectively. Wheat as a predecessor statistically significantly increased average by varieties incidence of both Fusarium spp. and Alternaria spp. in comparison with fallow. Nitrogen fertilizer statistically significantly increased average incidence of Fusarium spp., Alternaria spp. and B. sorokiniana. The incidence of fungal root infection and the effects of predecessor and fertilization statistically significantly depended on the variety.

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The morphophysiological parameters of leaves are often used for breeding material screening in selection programs for stress tolerance. In opposite, the pigments content (chlorophyll a and b, carotenoids) and their ratios, stoma quantity and size on both leaf sides and leaf area were involved into characterization of single soft spring wheat variety reactions to different climate conditions at different vegetation stages. Three geographic locations of the Krasnoyarsk Territory were involved. Chlorophyll content along with stoma area appeared to be the most sensitive traits and changed a lot, depending on weather conditions at the certain vegetation stage. So they were considered to be the main predictors of grain yield at 2020 vegetation period.