Protection of Grapevine Pruning Wounds from Eutypa Dieback. W. J. Moller, Plant Pathologist, Cooperative Extension Service, University of California, Davis 95616. A. N. Kasimatis, Viticulturist, Cooperative Extension Service, University of California, Davis 95616. Plant Dis. 64:278-280. Accepted for publication 15 October 1979. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1980. DOI: 10.1094/PD-64-278.

After inoculation with ascospores, grapevine pruning wounds were highly susceptible to the vascular pathogen Eutypa armeniacae for several days after late winter pruning; susceptibility then rapidly decreased. Wounds made on 1-yr-old wood of Vitis vinifera vines in California were more resistant than those made on older tissue, and wounds that were hand-painted immediately with the systemic fungicide benomyl at 10,000 ppm (a.i.) were significantly protected from infection. Thiabendazole at either 10,000 or 20,000 ppm was less effective.

Keyword(s): Cytosporina, deadarm.