Esca disease complex is probably the greatest threat for wine grapes nowadays, due to its severity on most cultivars, the complex interactions of the fungi associated with the disease and the lack of effective control protocols. Control of grapevine leaf stripe disease (GLSD), the most common disease in Europe within the esca disease complex on young vineyards (2 years old), was achieved by spraying pruning wounds with Remedier®, a bio-fungicide containing two selected strains of Trichoderma asperellum and Trichoderma gamsii developed by Isagro Company. A single aerial application carried out with machine sprayers at the end of winter or early spring on pruning wounds every year soon after pruning (1-2 days) on ten extremely susceptible cultivars and the evolution of the disease was monitored over 6 years. The results were significantly positive, showing a reduction in the number of symptomatic vines by 45-65% in the treated plots, compared with untreated control plots. In the same way, trials were performed in older vineyards 5-26 years old, to verify the efficacy of the product in controlling the spread of symptomatic plants and plant death. After 6 years of treatment and monitoring, not only the presence of vines showing leaf symptoms (GLSD) was reduced, but also the incidence of dead plants in the treated plots. These trials, both on young and older vineyards, confirm the importance of application with Remedier® to pruning wounds in order to reduce infection by pathogens. Remedier® was effective in reducing the occurrence of vines showing symptoms for the first time, presumably because they create a biological barrier against the pathogen, as shown in previous research with artificial inoculation. Applications must be repeated every year when environmental conditions (mainly T° higher than 10-12 °C) are suitable for a fast and effective fresh wound colonization by the strains of Trichoderma.
Disease management in nursery and vineyard Six years of trials on the activity of Remedier® against Esca disease complex in young and mature Italian vineyards
S DI MARCO;F OSTI;
2017
Abstract
Esca disease complex is probably the greatest threat for wine grapes nowadays, due to its severity on most cultivars, the complex interactions of the fungi associated with the disease and the lack of effective control protocols. Control of grapevine leaf stripe disease (GLSD), the most common disease in Europe within the esca disease complex on young vineyards (2 years old), was achieved by spraying pruning wounds with Remedier®, a bio-fungicide containing two selected strains of Trichoderma asperellum and Trichoderma gamsii developed by Isagro Company. A single aerial application carried out with machine sprayers at the end of winter or early spring on pruning wounds every year soon after pruning (1-2 days) on ten extremely susceptible cultivars and the evolution of the disease was monitored over 6 years. The results were significantly positive, showing a reduction in the number of symptomatic vines by 45-65% in the treated plots, compared with untreated control plots. In the same way, trials were performed in older vineyards 5-26 years old, to verify the efficacy of the product in controlling the spread of symptomatic plants and plant death. After 6 years of treatment and monitoring, not only the presence of vines showing leaf symptoms (GLSD) was reduced, but also the incidence of dead plants in the treated plots. These trials, both on young and older vineyards, confirm the importance of application with Remedier® to pruning wounds in order to reduce infection by pathogens. Remedier® was effective in reducing the occurrence of vines showing symptoms for the first time, presumably because they create a biological barrier against the pathogen, as shown in previous research with artificial inoculation. Applications must be repeated every year when environmental conditions (mainly T° higher than 10-12 °C) are suitable for a fast and effective fresh wound colonization by the strains of Trichoderma.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
