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

Abstract

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.

The use of a microbiological preparation based on Bacillus subtilis in organic viticulture

“…It has been shown that bacterial endophytes induce systemic plant resistance due to the accumulation of phenolic compounds [16]. We observed an increase in the content of phenolic components in grapes when biological preparations were used in agrotechnological schemes [12,17].…”

Influence of plant immunity inducers on the quality of apple fruit in Abkhazia

“…To develop effective protection of plants from diseases (including Apple trees from scab), it is necessary to evaluate the effect of protection agents in a specific zone [6]. Thus, immunity inducers proved to be an effective tool in apple tree protection systems against scab in Abkhazia, significantly reducing the degree of scab development [7].…”

The effect of aerosol treatment with calcium-based preparation on quality of table grape cultivar during storage

“…The important role of calcium is also determined in the grape storage. It is known that the more calcium is contained in a berry, the greater and longer its preservation period, due to the increased resistance of products to pathogens and the content of secondary metabolitesphenolic substances, stilbenes in particular [13].…”