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Effect of Growth Stage on Susceptibility of Grape Berry and Rachis Tissues to Infection by Phomopsis viticola

May 2001 , Volume 85 , Number  5
Pages  517 - 520

O. Erincik and L. V. Madden , Department of Plant Pathology, The Ohio State University, Wooster 44691 ; D. C. Ferree , Department of Horticulture and Crop Science, The Ohio State University ; and M. A. Ellis , Department of Plant Pathology, The Ohio State University

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Accepted for publication 31 January 2001.

Intact ‘Seyval’ grape clusters in the greenhouse and ‘Catawba’ clusters in the field were inoculated with conidia of Phomopsis viticola at seven Eichorn-Lorenz growth stages between 12 (prebloom) and 35 (véraison) in 1998. Five pots (10 clusters) were used per inoculation, and the experiment was repeated three times. Also, 10 to 20 randomly selected Catawba clusters were inoculated in the field for each of three replications at each growth stage. Studies were repeated in 1999. In addition, Chambourcin clusters were also inoculated at four growth stages in the greenhouse in 1999. Results obtained in the greenhouse and field during both years and for all cultivars indicate that berry and rachis infections can occur at all growth stages between 12 and 35 with no evidence of decreasing susceptibility over time. Results disagree with some literature reports that indicate that berry infection occurs primarily during bloom and shortly after bloom, and susceptibility decreases as fruit matures.

Additional keywords: integrated disease management, latent infection

© 2001 The American Phytopathological Society