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Response of Eight Cultivars of Chrysanthemum to Peroxyacetyl Nitrate. Francis A. Wood, Former Professor, Department of Plant Pathology, and Research Associate, Center for Air Environment Studies, The Pennsylvania State University, University Park 16802, Current address of senior author: Professor and Head, Department of Plant Pathology, University of Minnesota, St. Paul 55101; David B. Drummond, Former Research Assistant, Center for Air Environment Studies, and Graduate Student, Department of Plant Pathology, The Pennsylvania State University, University Park 16802, junior author is Plant Pathologist, Air Management Branch, Ministry of the Environment, Toronto 181, Ontario, Canada. Phytopathology 64:897-898. DOI: 10.1094/Phyto-64-897.

Eight cultivars of chrysanthemum were exposed to 20 and 60 pphm peroxyacetyl nitrate (PAN) for 4 h. Of 256 cuttings exposed, symptoms developed on one plant exposed to 60 pphm for 4 h. These results indicate that PAN-like symptoms observed on chrysanthemums in cities in the eastern USA are not due to PAN alone. They may be a result of PAN interacting with another pollutant or a response to other pollutants such as hydrogen chloride or aldehydes.