The Behaviour of some Recommended Grapevine Cultivars in a Sustainable Crop System to the Eriophyid Mites Attack

The behaviour of some vine cultivars when attacked by the eriophyid mites,Colomerus vitis Pagenstecher which causes grapevine erinose and Calepitrimerus vitis Nalepa, the agent that causes acariosis, is extremely divers, and inconsistent. Some cultivars are resistant under certain conditions (locations), while others are more sensitive. The purpose of this study is to establish the resistance/tolerance of some cultivars to the attack of eryophyid mites, the main pests in the vineyards of Transylvania. The experiments were placed in the experimental plantations of SCDVV Blaj located in the Tarnave vineyard plantated with cultivars: Brumăriu, Fetească regală, Pinot gris, Traminer roz, Muscat Ottonel, Sauvignon blanc, Riesling italian, Blasius, Selena. By analysing the symptoms on the before mentioned cultivars, the attack degree (AD%) varied form 1% for Selena to 47% for Blasius. Among the cultivars, in 2020 Brumăriu has the highest AD% caused by Colomerus vitis with 18.82 %, compared with Pinot gris who had the lowest attack rate 0.08%. All the cultivars were midresistant and resistant against the eriophyid mites, with one exception, Brumăriu has an Attack Degree (AD %) of 18.82%, at the attack of Colomerus vitis

Sulfur dioxide dinamic in Sauvignon Blanc and Neuburger dry white wines

The aim of this study is to evaluate the sulfur dioxide dinamic in two dry white wines Sauvignon blanc and Neuburger produced in Tarnave vineyard in order to check if there is any grape cultivar influence on this compound addition. Four wines (Sauvignon blanc 2018 and 2019 and Neuburger 2018 and 2019) were analysed for the free and total SO2 content during the four stages of vinification and storage: harvest, fermentation, maturation and storage for two years. At the maturation stage, for all these samples the following parameters were also measured: alcohol content (%), total acidity (g/L tartaric acid), volatile acidity (g/L acetic acid), dry extract (g/L), non-reducingdry extract (g/L), relative density at 20°C, total sugars (g/L), glucose and fructose (g/L). For the samples studied in this work, it was determined an increasing concentration of free and total SO2 starting with harvest continuing with fermentation, maturation, the firsty ear of storage and finishing with the second year of storage. Only for the free SO2 at the harvest stage, a cultivar influence was observed. In this study, the limits were between 6.25±1.25 mg/L and 32.55±1.25 mg/L for the dosed free SO2 and between 65.25±0.25 mg/L and 190.40±4.60 mg/L for total SO2. The analyzed wines kept their varietal characteristics and organoleptic properties, as Qualified Denomination of Origin (DOC) Târnave wines, with an admitted SO2 content

The Influence of Climatic Conditions on Downy Mildew and Powdery Mildew in Târnave Vineyard

The main diseases that affect the vineyards in the Târnave vineyard are: grapevine downy mildew caused by Plasmopara viticola and grapevine powdery mildew caused by Uncinula necator. The present study aimed to address the relationship between grapevine cultivars and the main diseases, downy mildew and powdery mildew, according to climatic variability and treatments applied. The analysis was carried out over two consecutive years 2021 and 2022 on five new cultivars, the creation of SCDVV Blaj: Selena, Blasius, Rubin, Radames and Brumăriu. Disease attack was determined during the vegetation period, until harvest. Cultivar susceptibility varied, some cultivars were relatively tolerant and no cultivar was highly resistant to both diseases. In addition, a difference between foliar and grape berry susceptibility to the two diseases was observed for several cultivars. This data provide a basis for developing low-treatment disease management strategies for specific grapevine cultivars based on downy mildew and powdery mildew susceptibility/tolerance

Influence of the Climatic Conditions of the Year 2022 on the Grapevine Phenology at SCDVV Blaj

The present article attempts to describe how the effects of climate conditions affect the evolution of the grapevine phenological period in 2022. The cultivars used were Selena, Blasius, Rubin, Radames and two clones obtained approved in SCDVV Blaj: Sauvignon blanc 9Bl and Fetească albă 29 Bl. The experiment was carried out at SCDVV Blaj and included field observations, monitoring weather conditions such as temperature and precipitation. For the onset of the phenological phases: budding, flowering, veraison (colour change of grape berries) and ripening-maturation. The phenological phases of the grapevines were monitored for a growing season according to the protocol established, taking into account the BBCH grade. Temperature and precipitation are the two main climatic factors that affect the growth and development of the grapevines. Due to existing thermal conditions and continued global warming, the Târnave vineyard region is a recommended place for white grape cultivation

Fungal Grapevine Trunk Diseases in Romanian Vineyards in the Context of the International Situation

Vitis vinifera, known as the common grape vine, represents one of the most important fruit crops in the world. Romania is a wine-producing country with a rich and long tradition in viticulture. In the last decade, increasing reports of damage caused by grapevine trunk diseases (GTDs) have raised concerns in all wine producing countries. Up to now, no study was performed regarding the GTDs situation in Romania, an important grapevine grower in Europe. In this study, we aim, after a comprehensive presentation of the fungal GTDs worldwide, to review the scientific information related to these diseases in Romania in order to open a national platform in an international framework. In order to achieve this, we consulted over 500 references from different scientific databases and cited 309 of them. Our review concludes that, in Romania, there is little amount of available literature on this matter. Three out of six fungal GTDs are reported and well documented in all of the Romanian viticultural zones (except for viticultural zone 4). These are Eutypa dieback, Phomopsis dieback, and Esca disease. Of the fungal pathogens considered responsible Eutypa lata, Phomopsis viticola and Stereum hirsutum are the most studied and well documented in Romania. Management measures are quite limited, and they mostly include preventive measures to stop the GTDs spread and the removal of affected grapevines