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- W2012685856 abstract "Cornellian cherry (Cornus mas) is an enduring dogwood that is primarily grown as an ornamental plant in North America, but in parts of Europe, its fruit is eaten fresh or pickled or made into soft drinks, wine, and liqueur. Cornellian cherry has demonstrated longevity and adaptability and has had no previous disease or pest problems. In Tennessee, a leaf blight was first observed during spring 1996 in nursery plants imported from Europe. The disease quickly spread to other C. mas plants within the nursery and has caused severe damage for three consecutive years. The disease affected mostly leaves and young shoots, causing dark brown necrotic lesions and some die back. In early stages, leaf infection consisted of discrete lesions, angular in shape and surrounded by a chlorotic halo. These lesions eventually coalesced to form large dark necrotic patches that covered a large portion of the leaf or the entire leaf. Disease symptoms were restricted to early spring during wet and cool weather; later in the season new growth was free of symptoms. A bacterium was isolated from infected plants and tested for pathogenicity on C. mas ‘Redstone’ and C. florida. Symptoms were reproduced on C. mas but not on C. florida. The bacterium was reisolated from inoculated plants, was characterized as gram-negative and rod-shaped, and produced fluorescent pigment on King's medium B agar. The bacterium had a positive reaction to the Levan test and negative reactions to potato rot and arginine dihydrolase tests and was identified as Pseudomonas syringae (1). Samples of the bacterium were sent to Texas A&M University, College Station, for fatty acid analysis, and the results confirmed the identity of P. syringae. P. syringae has caused severe damage in C. florida in the northwestern United States (2); however, this is the first report of P. syringae on C. mas. References: (1) N. W. Schaad, ed. 1988. Laboratory Guide for Identification of Plant Pathogenic Bacteria. The American Phytopathological Society, St. Paul, MN. (2) W. A. Sinclair et. al. 1987. Diseases of Trees and Shrubs. Cornell University Press, Ithaca, NY." @default.
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- W2012685856 date "2000-02-01" @default.
- W2012685856 modified "2023-09-25" @default.
- W2012685856 title "First Report of Leaf Blight Caused by <i>Pseudomonas syringae</i> on <i>Cornus mas</i>" @default.
- W2012685856 doi "https://doi.org/10.1094/pdis.2000.84.2.200a" @default.
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