Evaluation of Cultivars and Spray Programs for Organic Grape Production in Virginia

The French American hybrid grape cultivars Corot noir and Arandell ( Vitis sp.), Vidal blanc Petit Manseng vinifera ), along with different spray programs, were evaluated for potential organic production in Virginia from 2013 to 2014. Results obtained the study demonstrate that wine can be achieved by using select programs. With exception of blanc, disease severity incidence below threshold maintaining healthy vines all organically managed cultivars. ‘Vidal blanc’ was not sufficiently resistant downy mildew Plasmopara viticola precluding it management Virginia. also demonstrated significant resistance cultivar Arandell, released Cornell University (Ithaca, NY) 2013. results suggest registered fungicide Bacillus subtilis is effective reducing black rot Guignardia bidwellii ) phomopsis cane leaf spot Phomopsis ). chemistry berries harvested 2014 met minimum requirements soluble solids, titratable acidity, pH ranging 18.7% 20.2%, 7.6 8.0 g·L −1 , 3.3 3.4, respectively, ‘Arandell’ ‘Corot noir’; 21.0% 24.4%, 7.8 9.6 2.7 2.9, ‘Petit Manseng’ juice.