Chemical Control of Grapevine Main Pathogens under the Climate Conditions of Baia

The experiences were performed in the Tautii Magheraus locality, located at 3 km from Baia Mare. Five variety of grapevine were studied: Cramposie , Feteasca regala , Muscat Ottonel  , Perla de Zala and Italian Riesling . The resistance of the cultivated grapevine varieties against the attack of the main phytopathogenic fungi: Plasmopara viticola , Uncinula necator , Botryotinia fuckeliana  , in terms of the 2011 year, was studied. In order to assess the resistance of the grapevine varieties against the phytopathogenic agents attack, the frequency, intensity and degree of attack were determined. The most sensitive to the attack of downy mildew on leaves was the Italian Riessling , with a degree of attack of 71.5%; and the most resistant variety was Perla de Zala , with a degree of attack of 26%. The most resistant to the attack of grape powdery mildew on leaves was the Muscat Ottonel  variety, with a degree of attack of 8.1%; and the most sensitive was the Italian Riesling variety with 18.1%. In case of the attack of downy mildew on grapes, the most sensitive was the Italian Riesling  variety with a degree of attack of 11.5%; and the most resistant was Perla de Zala with 2.5%. During the vegetation of the 2011 year, the chemical protection was performed with fungicides that were administered by seven sprayings.