Influence of the use of fungicides with growth-regulating properties on the winter survival of winter rapeseed hybrids
Abstract
Purpose. The aim of the research was to evaluate the effectiveness of a technological option involving the use of fungicides with growth-regulating properties at the BBCH 14–18 stage: Caramba Turbo (0.65 l/ha) + Bukat (0.35 l/ha), in shaping the morphological development of winter rapeseed plants before entering the winter period, and their phytopathological condition after overwintering, in order to ensure optimal winter survival and crop condition at the date of vegetation renewal.Methods. The study was conducted during 2022–2025 at the experimental field of Vinnytsia National Agrarian University on grey forest soils with medium fertility potential. The experiment was repeated four times. Variants were arranged systematically in two tiers. The design of the experiment included a comparison of two options – control and experimental – using a combination of fungicides with growth-regulating effects (Bukat and Caramba Turbo) against two variants of basic autumn fertilization.Results. It was found that the application of the studied combination of fungicides with growth-regulating properties allows optimization of the morphotype of high-intensity winter rapeseed hybrids before wintering: the diameter of the root collar increased on average by 11.41%, the height of the growth point above the soil surface decreased by 13.8%, the number of leaves per plant increased by 10.1%, and root system length increased by 13.7%. This treatment option increased plant survival during overwintering by at least 12%, while reducing the incidence of major seedling diseases by the time of spring vegetation renewal, with a biologically achievable effect at the level of 80–83%.Conclusions. The results proved the positive effect of applying the combination Caramba Turbo (0.65 l/ha) + Bukat (0.35 l/ha) at the BBCH 14–18 phenological stage, which ensures the formation of the following plant ideotype: root collar diameter – 1.70 cm, height of growth point above soil – 1.20 cm, number of leaves per plant – 10, root system length – 21.2 cm, with a concomitant biological effect of reducing combined phytopathogenic infections of winter rapeseed plants at the date of vegetation renewal by 82.98%, while simultaneously increasing winter survival by 14.53% compared to the experimental control.
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