N. Prodanova-Marinova1*, Y. Belberova1, F. Emurlova2

1Agricultural Academy, Institute of Viticulture and Enology, 5800 Pleven, Bulgaria
2Department of Plant Production, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria

(Manuscript received 21 June 2022; accepted for publication 31 July 2023)

Abstract. The study was carried out in the period 2019-2021 in the vine nursery of the Institute of Viticulture and Enology, Pleven (43.42°N 24.62°E and 140 m altitude) with Muscat Plevenski and Bolgar varieties, grafted to Berlandieri x Riparia SO4 rootstock. The cuttings were rooted in two-row beds without mulching with polyethylene foil. The planting depth was 0.15 m, at 0.07-0.08 m intra-row distance and 0.5 m between the rows in the bed. The distance between the beds was 2 m. The experiment was conducted in four replicates The buds from the first to the fifth eye were examined twice – in the second half of October (15-20 October) and after the removal of the vines from the nursery (01-08 November). The proportion of necrotic buds was determined from samples of 10 shoots per replicate. The manifestations of primary bud necrosis in Muscat Plevenski and Bolgar were observed without exception during the three years of the experiment. Damage was found, regardless of the bud’s location along the examined length of the shoot, with no specific trend of a particular node being affected.