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Etiology

Effect of Ozone on Infection of Wild Strawberry by Xanthomonas fragariae. J. A. Laurence, Department of Plant Pathology, University of Minnesota, St. Paul, MN 55108, Present address: Boyce Thompson Institute for Plant Research, 1086 North Broadway, Yonkers, NY 10701; F. A. Wood, Department of Plant Pathology, University of Minnesota, St. Paul, MN 55108, Present address: Office of the Dean for Research, University of Florida, Gainesville, FL 32611. Phytopathology 68:689-692. Accepted for publication 12 October 1977. Copyright © 1978 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-68-689.

Exposure of wild strawberry (Fragaria virginiana) to ozone concentrations of 294 μg/m³ (0.15 ppm) for 2 hr resulted in necrotic flecks on the upper leaf surface. Exposure to higher concentrations for longer periods resulted in increased injury. Infection of wild strawberry by Xanthomonas fragariae was inhibited when plants were exposed to 392 μg/m³ (0.20 ppm) O₃ for 3 hr before or after inoculation. Exposure to 157 μg/m³ (0.08 ppm) O₃ for 3 hr did not result in consistent inhibition of infection.