Data di Pubblicazione:
2013
Citazione:
EPI model for management of grapevine downy mildew in Lombardy / A. Vercesi, S.L. Toffolatti, P. Campia, G. Venturini, P. Fremiot, A. Pedrazzini, D. Sordi, G. Rho, N. Parisi, M. Salvetti, B. Cavagna, M. Ciampitti, R. Tonesi, S. Strizyk. ((Intervento presentato al convegno Future IPM in Europe tenutosi a Riva del Garda nel 2013.
Abstract:
Grapevine downy mildew, caused by Plasmopara viticola, often requires numerous chemical
treatments in order to reduce serious damages on leaves and clusters. The management strategy
suggested by the Italian extension services is based on the occurrence of meteorological
conditions suitable for P. viticola infections and the calculation of the incubation period. However
various treatments executed following this strategy could be avoided in presence of low infection
risk. EPI (Etat Potentiel d’Infection), an heuristic model designed for the assessment of infection
likelihood of P. viticola, can be used to define a rational treatment strategy against the pathogen.
The aim of this work is to compare the treatment schedule based on the EPI simulations with the
extension service strategy in vineyards located in Lombardia, by assessing the corresponding
infection indexes and the number of treatments applied in the different plots. Twenty
experimental assays were carried out from 2008 till 2012 in Oltrepo Pavese, Valtellina, Sirmione
(BS) and in the Mantova province, at Monzambano (MN) and Mantova (MN). In each experimental
vineyard, the treatments corresponding to the two strategies were carried out in two plots,
consisting of three rows, 80 m long. An analogous plot was not treated against P. viticola. The
downy mildew epidemic development was assessed weakly in the untreated plots on 100 leaves
and 100 clusters located in four subplots and at the end of the season on the treated plots. Each
grapevine organ was classified in one of the following classes: 0- healthy; 1: 0.1-2.5 % symptomatic
surface; 2: 2.5-5 % symptomatic surface; 3: 5-10 % symptomatic surface; 4: 10-25 % symptomatic
surface; 5: 25-50 % symptomatic surface; 6: 50-75 % symptomatic surface; 7: 75-100 %
symptomatic surface. The percentage infection indexes (I%I) per treatment and grapevine organs
were calculated and compared using one-way ANOVA. The I%I assessed on the plots treat ed
according to the different strategies were analogous, but the EPI strategies required a lower
number of treatments. Overall, the treatment number was reduced by 57 % by EPI and in three
vineyards no treatments were applied against P. viticola. Therefore the simulations obtained by
using the EPI model represent a valuable indication for defining a sustainable and rational
treatment schedule against P. viticola.
Tipologia IRIS:
14 - Intervento a convegno non pubblicato
Elenco autori:
A. Vercesi, S.L. Toffolatti, P. Campia, G. Venturini, P. Fremiot, A. Pedrazzini, D. Sordi, G. Rho, N. Parisi, M. Salvetti, B. Cavagna, M. Ciampitti, R. Tonesi, S. Strizyk
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