The annual project ‘Resistance elicitors to control epidemics of Flavescence dorée’ (FLUTE) will evaluate the effects on the incidence of grapevine infection with Flavescence dorée of i) an abiotic treatment based on benzothiadiazole, ii) two biotic treatments based on mycorrhizae and rhizospheric bacteria, and iii) a treatment based on Trichoderma. For the benzothiadiazole-based elicitor treatment, the influence of grapevine variety in the response to the elicitor will also be addressed. For all treatments, biotic and abiotic, we will study the role of the plant age in relation to its response to the resistance elicitor. The treatments will be carried out in the field and the chosen experimental vineyards will be characterized by a high FD infection pressure. The project has a duration of one year, however, since the latency time of the FD infection from the inoculation to the onset of symptoms is generally one year, it is expected that final results will be obtained at least after a second year of activities.
The overall objective of the project is to evaluate the incidence of FD in the vineyard following treatment with biotic and abiotic resistance elicitors.
The specific objectives concern the measurement of the effectiveness of treatments based on three biotic elicitors and an abiotic one in reducing the number of vine cuttings (Cv Barbera) infected after exposure for one growing season to FD infection by the vector naturally present in the vineyard. In particular, it will be verified whether the age of the vine (cv Barbera) at the time of application of the benzotiadiazole treatment influences the protective effect of the treatment against FD in the field. A third aspect will concern the impact of the genetics of the vine on the protective effect of the benzotiadiazole-based resistance elicitor against the FD, through the application to plants belonging to six local varieties, three with white and three with red berries, respectively. The three objectives will be measured in terms of the number of i) plants infected by FD at the end of the growing season, ii) monitoring of Scaphoideus titanus in the period May-October, iii) physiology of the plants and iv) their main production parameters.