Estudio de los niveles de los principales fitopatógenos para la optimización de cosechas de Vitis vinifera en Valdeorras, Ourense (1998)

Abstract

RODRÍGUEZ RAJO, F.J., SEIJO COELLO, M.C. & JATO RODRÍGUEZ, M.V. 2002. Study of the main phytopatogenic level’s in order to optimize the harvest of Vitis vinifera in Valdeorras, Ourense (1998). Bot. Complutensis 26: 121-135. Estudio de los niveles de los principales fitopatógenos para la optimización de cosechas de Vitis vinifera en Valdeorras (1998). The peculiar climatological characteristics of Galicia favours the appearance in the vineyards of the diseases produced by fungus as grey mould, powdery mildew or downy mildew that endangers the grape production provoking millionaire losses. With the aim to know the level of fungal spores, it was placed an Hirst type volumetric sampler in a vineyard of Ourense. Of the tree pathogenic fungus studied, it was found important quantities of Botritys fungal spores, that amount a total of 12303 spores. The moment of the day with highest concentrations are the 19-20 hours. The total values registered by Uncinula and Plasmopara were minor (1456 y 242 spores respectively). Dew temperature for Botrytis cinerea, maximum temperature for Uncinula necator and external humidity for Plasmopara viticola, were the meteorological variables that exert the highest positive influence in the spore concentrations of the vineyard. Finally the models attempted for the prediction of the infections that takes into account the meteorological variables in addition with the quantity of pathogenic spores existing, have the best prediction capacity.