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Resistance to Dothistroma pini within Geographic Sources of Pinus nigra. Glenn W. Peterson, Plant Pathologist, Rocky Mountain Forest and Range Experiment Station, Forest Service, USDA, Lincoln, Nebraska 68503; Ralph A. Read, Silviculturist, Rocky Mountain Forest and Range Experiment Station, Forest Service, USDA, Lincoln, Nebraska 68503, in cooperation with the University of Nebraska Agricultural Experiment Station. Phytopathology 61:149-150. Accepted for publication 3 September 1970. DOI: 10.1094/Phyto-61-149.

Trees of Pinus nigra from 21 geographic sources were evaluated for resistance to the needle blight fungus, Dothistroma pini, 5 and 6 years after they were planted in eastern Nebraska. Some individual trees within 16 sources were highly resistant; those from only one geographic source (Yugoslavia) showed universally high resistance.