GRAPEVINE VARIETIES BEHAVIOR ON MAINE PATHOGENS ATTACK IN 2008 FROM THE AMPELOGRAPHICAL COLLECTION OF U.S.A.M.V. IASI PUBLISHEDNicoleta Irimia, E. Ulea, Andreea Mihaela Bălău
One of the reasons for lower grapes production is the pathogens attack in the vineyards. The grapevine mildew together with the powdery mildew and the grape grey mould are considered the most damaging diseases of the grapevine. The mildew and powdery mildew attack all aerial parts of the grapevine plants, while grape gray mould is frequently encountered on the mature berries, close to harvest. The study of these three pathogens was due to the fact that, they are present every year in the vineyards and producing attacks materialized in significant economic losses. The data regarding pathogens attack to the vines was conducted through surveys. The biological material was represented by different varieties of grapes, table grapes and wine grapes. The field observation was correlated with yearly phonological and ecological elements which lead to prognoses and control of main pathogenic agents. Depending on degree of attack recorded for each variety was established the expression of varietals and resistance of analyzed sorts (by OIV 459). The grape varieties which were taken in study showed different reactions under the same environmental conditions, materialized by different attack degrees to grapevine mildew, powdery mildew and grape grey mould. This paper contains results regarding the epidemiology and evolution of the main pathogens that attack the analyzed grapevine varieties.
grapevine disease; frequency; intensity; attack level