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Effect of Temperature on Bacterial Canker in Peach Seedlings Grown in Old and New Peach Soil. J. W. Daniell, Departments of Horticulture and Plant Pathology, University of Georgia, Georgia Station, Experiment 30212; W. A. Chandler, Departments of Horticulture and Plant Pathology, University of Georgia, Georgia Station, Experiment 30212. Phytopathology 64:1284-1286. Accepted for publication 28 May 1974. DOI: 10.1094/Phyto-64-1284.

Peach seedlings were grown in soil from old and new peach sites for 7 mo in containers and then inoculated with either of two isolates of Pseudomonas syringae or water and held at 3, 8, 23 C, and variable (outdoor, 17 to 14 C) temp. Neither the soil source nor isolate source differentially affected the seedling growth, canker length, or seedling mortality. Canker length and seedling mortality were positively related to temp. Plants at variable temp with a mean of 3.3 C and a mean maximum of 8.5 C developed longer cankers than at a constant temp of 8 C. There was no infection or mortality of seedlings inoculated with water.

Additional keywords: tree-short-life complex, peach tree decline.