Experiments of heat treatment on dormant wood of grapevines affected by flavescence doree [Vitis vinifera L. - Veneto]
2000
Bianco, P.A. (Consiglio Nazionale delle Ricerche, Milan (Italy). Centro di Studio per il Miglioramento Sanitario delle Colture Agrarie) | Fortusini, A. | Scattini, G. | Casati, P. (Milan Univ. (Italy). Istituto di Patologia Vegetale) | Carraro, S. | Torresin, G.C. (Provincia di Vicenza (Italy). Servizio Fitopatologico)
Thermotherapy experiments were conducted on dormant wood of three different grapevine varieties (Cabernet franc, Garganega and Tocai rosso) affected by flavescence doree (FD). Ripened canes were submitted to hot-water treatments at two different conditions: 50 deg C for 45 minutes and 45 deg C for 3 hours. After treatment, rooted cuttings from treated and untreated infected canes were transferred into an insect-proof screenhouse. No symptoms of the disease were observed during the three years of observation on vines obtained from hot-water treated material, while high percentage of symptomatic plants were detected among the vines coming from untreated canes (50% of the vines belonging to Cabernet franc and Tocai rosso cultivars and 10.7% of those of Garganega cultivar): the presence of the phytoplasma, agent of FD (16SrV-C) was detected only in grapevine plants obtained from untreated canes. Data from the present work indicate that thermotherapy can be an effective practice for FD eradication from grapevine propagating material
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