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One of the ways to reduce the pesticidal burden in mature ampelocenoses is the use of foliar bio-preparations of multifunctional action. We studied the influence of growth bioregulators “Albit” and “Mival-Agro” at reduced by 25–50% fungicidal load on productivity and phenolic complex composition (using the HPLC method) of  Vitis vinifera “Asma”  (Crimean autochthonous table cultivar),  “Cabernet Sauvignon”  and table grapes of complex genetic structure “ Moldova ”, grown in the mountain-valley seaside region of Crimea. It was established that bio-regulators increase the harvest of grapes, especially in the first and third years of treatment, depending on the preparation and grape cultivar, by 27–64% and 24–29%, respectively, as compared to control; the bunch weight increased by 134 ± 41%. The first two years of treatment enhance sugar accumulation in berries by 0.7–2.6 Brix. “Albit” preparation proved to be more effective as compared to “Mival-Agro”. The use of “Albit” on “ Moldova ” and “ Cabernet Sauvignon ” grapes increased components content in the berries by 19%–88% relative to control, depending on the cultivar and year of treatment, of which: anthocyanins – by 23–83%, stilbenes – by 24–138%. Regardless of treatment, the anthocyanin complex consisted by 75–87% of malvidin monoglucosides in “ Cabernet Sauvignon ” and “ Asma ”; 22–56% of malvidin monoglucosides and 21–62% of malvidin diglucoside in “ Moldova ”. The studied preparations had no significant impact on the quality of wines from “ Cabernet Sauvignon ”, however, they improved the quality of table grapes and their preservation capacity during storage.

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The effect of foliar fertilizing on ecological optimization of the application of fungicides on the productivity and phenolic complex composition of grapes