The effect of plant growth regulators on the growth, development, and incidence of fungal diseases of black currant in conditions of the city of Moscow

Abstract

Small-plot field experiments were laid on the territory of the Educational and Experimental Farm of the FSBEI HE RSAU-MAA named after K.A. Timiryazev on the territory of the city of Moscow. The following plant growth regulators were used in the experiments: Zavyaz, KRP (5.5 g/l gibberellic acid sodium salts); Obereg, R (0.15 g/l arachidonic acid), Zircon, R (0.1 g/l hydroxycinnamic acids), Epin-Extra, R (0.025 g/l 24-epibrassinolide). As part of the study, for two years, young blackcurrant plantings of three varieties with different maturation periods were treated with plant growth regulators. During the growing season, plant growth and development were recorded, the development of fungal diseases was recorded – powdery mildew (Sphaerotheca mors-uvae) and blister rust (Cronartium ribicola). Accounting for the yield of berries in various experiment options was carried out in comparison with the control version. The results of the study showed that the double use of growth regulators Zavyaz, KRP, Obereg, R, Zircon, R, and Epin-Extra, R positively influenced the formation of growth of black currant shoots and significantly reduced the development of fungal disease - powdery mildew on the leaves and berries of this crop.