Journal of Food, Agriculture and Environment

Variation of attack degree of downy mildew (Plasmopara viticola) in five wine grape varieties, under conventional and organic control treatments

Author(s):

Claudiu Ioan Bunea ¹*, Daniela Popescu ², Andrea Bunea ¹, Marin Ardelean ¹

Recieved Date: 2013-08-03, Accepted Date: 2013-10-20

Abstract:

Five wine grape (Vitis vinifera) cultivars (Aromat de Iasi, Feteasca Regala, Pink Traminer, Italian Riesling and Muscat Ottonel) were tested in 2010-2011 in Cluj County, Romania, concerning their level of attack degree (AD%) with downy mildew (Plasmopara viticola Berk & Curt) under two types of disease control treatments: conventional and organic. Four (2+2) and six (3+3) specific treatments were applied both in the conventional and organic variants of disease control at two different growth stages. Consequently a three way experiment was obtained: disease control system x number of treatments x cultivar. The two types of disease control were also differentiated by adequate field technologies and fertilization for organic practices and for the conventional one. In the two experimental years AD% was registered in each cultivar under natural infections with downy mildew since the disease symptoms evidently appeared on the leaves of wines. In the least affected cultivars Aromat de Iasi (3.51%) and Pink Traminer (2.80%) the AD% level was statistically identical under both conventional and organic treatments. These results are of the great interest since such varieties seem to be better adapted to organic control practices of downy mildew and, consequently, are recommended for organic grape yards and they could prove as valuable genitors in creating new grape varieties adapted to organic control of downy mildew.

Keywords:

Wine grape varieties, Vitis vinifera, downy mildew, leaves, attack degree (AD%), conventional and organic disease control

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Journal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 3&4
Category: Agriculture
Pages: 1166-1170

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