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.
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