Effect of plant growth regulators on the induction of peach resistance to leaf curl

Abstract

The article presents data from studies of the effect of growth regulators when applied for three years in peach plantations in the humid subtropical zone of the Black Sea coast of Russia. The influence of drugs (Zerebra® Agro (colloidal silver + polyhexamethylenebiguanide hydrochloride), Epin-Extra® (24-epibrassinolide) and Biosil® (triterpene acids)) on the degree of development of peach leaf curl (pathogen – Taphrina deformans (Berk) Tul.) was analyzed. The preparations were used in pure form and in combination with fungicides, the dosage of which was two times lower than in the standard. Already in the first year of the experiment, an increase in the resistance of the peach to leaf curl was noted. The maximum biological efficiency (up to 80.3%) in relation to leaf curl was observed when using Zerebra Agro in a tank mixture with fungicides. An inverse correlation was established between the degree of development of leaf curl and the level of antioxidant system enzymes activity (catalase and guaiacol peroxidase), which confirms the immunity-inducing effect of the growth regulators use.