Effects of plant growth regulators and agrochemicals on the development of frost-damaged grape shoots

We conducted a study into the effect of various agrochemicals on the restoration of fruiting grape plants after spring frosts. Experiments were conducted using Pamyat Dombkovskoy, Liberty, and Ranniy Magaracha varieties cultivated in the Pavlovsky district of the Voronezh Oblast (Russia) after the late spring frosts of 2024– 2025. The following preparations were used: Domotsvet (liquid form, 0.1 mL/L), Biotonus-ME (powder form, 3 g/L), EcoFus (liquid form, 3 mL/L); Cytovit (liquid form, 1 mL/L); Ferovit (liquid form, 3 mL/L); Epin-Extra (liquid form, 0.2 mL/L); Ribav-Extra (liquid form, 0.1 mL/L). Plants were sprayed twice during the season. Treatment of plants with water served as a control. The maximum number of shoots was formed by the plants of the Liberty variety under the influence of the Ferovit and Epin-Extra preparations. The average number of internodes increased significantly on Liberty shoots treated with Ferovit and Epin-Extra. No significant differences in the internode length were found across all treatments, depending on the variety.