Borgo, M., & Michielini, C. 2000 Diffusione naturale dell'accartocciamento fogliare della vite su varieta e biotipi di Vitis vinifera. [Natural spread of grapevine leafroll on varieties and biotypes of Vitis vinifera.]. Rivista di Viticoltura e di Enologia 53(4): 3-13.

Notes: The trend of the diffusion of grapevine leafroll disease cultivars Carmenere, Cabernet sauvignon and Merlot grafted on 420A and Kober 5BB was analysed for 16 years. The natural spread of the disease, due to the closterovirus, Grapevine leafroll-associated virus 3 (GLRaV-3), increased over the years and proved to be faster and particularly intense on Carmenere and Merlot. The surveys carried out on insect occurrence during the last years of the study highlighted the presence of pseudococcid mealybugs (possible virus vectors), although no close relationship with the insect's presence and diffusion of the disease was observed.