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Soil Salinity Related to Ponderosa Pine Tipburn. Robert A. Spotts, Former Graduate Student, Botany and Plant Pathology Department, Colorado State University, currently Public Health Chemist, Colorado Department of Health, Denver 80220; Jack Altman(2), and John M. Staley(3). (2)(3)Professor, Botany and Plant Pathology Department, Colorado State University; and Plant Pathologist, Rocky Mountain Forest and Range Experiment Station, Forest Service, USDA, with central headquarters maintained at Fort Collins in cooperation with Colorado State University, Fort Collins 80521. Phytopathology 62:705-708. Accepted for publication 19 January 1972. DOI: 10.1094/Phyto-62-705.

Ponderosa pine tipburn symptoms identical to those occurring naturally in Denver, Colo., were induced with a variety of chloride salts applied in solution. A strong positive correlation was found between experimentally induced needle injury and foliar concentration of Cl. Total soluble salt levels and chloride levels in soil around injured pines in Denver exceeded levels in soil around healthy pines.