13 research outputs found
Valutazione dell'efficacia dell'isomero biologicamente attivo di benalaxyl nei confronti di Plasmopara viticola
Ulteriori verifiche della durata del periodo d'incubazione di Plasmopara viticola (Berk. et Curt.) Berl. e De Toni in Veneto
Dal 1996 al 2003 sono state effettuate indagini riguardanti la durata del periodo d'incubazione di Plasmopara viticola inoculando sperimentalmente foglie e grappoli di tre diversi vigneti, due di cv Corvina siti in provincia di Verona e uno di cv Merlot in provincia di Padova. I risultati ottenuti hanno confermato che su foglia il periodo d'incubazione \ue8 molto simile a quello pervisto sulla base del metodo individuato da Goidanich et al. (1957), mentre su grappolo esso \ue8 pi\uf9 prolungato, pur avendo una durata variabile, specialmente in conseguenza di inoculazioni effettuate nelle fasi fenologiche precendenti l'allegagione
Dinamica di germinazione delle oospore di Plasmopara viticola e comparsa delle infezioni primarie
Andamento delle epidemie di Plasmopara viticola e valutazione del modello EPI nei vigneti lombardi
Experimental study of the influence of some parameters on the helical dislocations equilibrium in quenched alloys
Monitoraggio e simulazione dell'andamento epidemico di Plasmopara viticola (Berk. et Curt.) Berl. e De Toni in Veneto
EPI model for management of grapevine downy mildew in Lombardy.
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\u2019Infection), 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