Inclusion of growth regulators in the protection system against apple scab and moniliosis of Golden Rangers plantations in the Republic of Abkhazia

The cultivated apple is a traditional crop for Abkhazia. However, the humid subtropical climate here promotes the intensive development of fruit diseases, such as scab (caused by Venturia inaequalis (Cooke) G. Winter) and moniliosis (caused by Monilinia fructigena (Pers.) Honey). Research efforts today are aimed at searching for formulations capable of enhancing the natural immunity of plants against these diseases. In this work, we assess the possibility of extending the protection system against apple scab and monilial rot by including a single treatment with growth regulators during the budding phase. The studies were conducted in 2022–2024 in Golden Rangers apple tree plantations in the Gulrypsh district of the Republic of Abkhazia using a generally accepted methodology. The immune-stimulating effect of the Zerebra agro©, Biosil©, and Stimmunol EF© growth regulators against fruit scab was observed in the second and third years of application. With regard to monilial rot, the effect was observed in the third year of application. Yantarin BAU© demonstrated an increased biological effectiveness against scab and moniliosis already after the first application. A single application of the Zerebra agro©, Biosil©, Stimmunol EF©, and Yantarin BAU© growth regulators during the budding period did not increase the apple yield. Energiya-M, KRP© did not exhibit an immune-stimulating effect against either scab or moniliosis. However, a single treatment of the plants with this preparation during the budding period resulted in a 23.4 % increase in the apple yield compared to the control.

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