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Ozone Injury Increases Infection of Geranium Leaves by Botrytis cinerea. W. J. Manning, Assistant Professor, Department of Environmental Sciences, University of Massachusetts, Waltham 02154; W. A. Feder(2), and I. Perkins(3). (2)(3)Professor, and Technician, respectively, Department of Environmental Sciences, University of Massachusetts, Waltham 02154. Phytopathology 60:669-670. Accepted for publication 6 November 1969. DOI: 10.1094/Phyto-60-669.

Detached and attached, inoculated and noninoculated, ozone-injured and noninjured leaves from the lower, middle, and terminal regions of plants of geranium cultivars Enchantress and White Mountain were observed for infection by Botrytis cinerea. Previous exposure to ozone did not appreciably influence the susceptibility of leaves of either geranium cultivar to infection by B. cinerea, unless there was visible ozone injury. Ozone-injured, necrotic tissues on older attached and detached geranium leaves of both cultivars served as infection courts for B. cinerea.