Effect of Ozone on Infection of Wild Strawberry by Xanthomonas fragariae

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Abstract
Exposure of wild strawberry (Fragaria virginiana) to ozone concentrations of 294 .mu.g/m3 (0.15 ppm) for 2 h 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 X. fragariae was inhibited when plants were exposed to 392 .mu.g/m3 (0.20 ppm) O3 for 3 h before or after inoculation. Exposure to 157 .mu.g/m3 (0.08 ppm) O3 for 3 h did not result in consistent inhibition of infection.

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