The study was aimed at evaluating the impact of an experimental biostimulator (BS) on the development of foliar and stem diseases in common spring wheat (Triticum aestivum L., var. Agata) as well as on the plant tissue colonization by various micromycetes. The study was conducted in 2024–2025 in the Moscow region. BS was produced using a proprietary technology of a catalytic oxidation of plant waste. The experimental design included the following treatments: untreated control; Epin-Extra, S (50 mL/ha) as a commercial standard; and BS solution (150 mL/ha) taken at concentrations of 1 × 10–4 (BS 10–4), 1 × 10–5 (BS 10–5), and 1 × 10–6 (BS 10–6) mL/L. Wheat crops were treated during the tillering stage (BBCH 27) with a working solution spray volume of 400 L/ha. Prior sowing, seeds were treated with TMTD (4 L/t). The spectrum of diseases and colonizing micromycetes was found to be dependent on the plant developmental stage. A statistically significant reduction in the leaf rust progression was observed in all experimental treatments during the watery ripe (BBCH 71) and milk ripeness stages. During the flowering stage, stem rust development in the BS-treated variants was significantly lower than in the control (0.10%) by 0.02–0.09%, while the similar reduction in the Epin-Extra, S variant was lower than in the control by 0.04%. Leaf septoria blotch development in BS-treated and Epin-Extra variants decreased by 7.7–15.7% and 2.8%, respectively, compared to the control; at the milk ripeness stage, the treatment with BS 10–6 provided a 1.5–2.0-fold reduction of disease progression rate. Glume blotch development in the BS 10–6 variant was 2.0–2.6% at the milk ripeness stage and 7.3–7.5% at the wax ripeness stage (compared to 6.4–7.4% and 13.7–15.6% in the control, respectively). The lowest levels of a stem colonization by Fusarium fungi were observed for the BS 10–4 and BS 10–6 variants demonstrating a 1.6–2.0-fold and 1.4–1.9-fold reduction compared to the control and the commercial standard, respectively.
Demin et al. (Mon,) studied this question.