Austrian Pine Injury Traced to Ozone and Sulfur Dioxide Pollution. E. Brennan, Professor, Department of Plant Pathology, New Jersey Agricultural Experiment Station, Rutgers University, New Brunswick 08903. I. Leone, Professor, and R. Harkov and A. Rhoads, Former Graduate Students, Department of Plant Pathology, New Jersey Agricultural Experiment Station, Rutgers University, New Brunswick 08903. Plant Dis. 65:363-364. Copyright 1981 American Phytopathological Society. DOI: 10.1094/PD-65-363.

A foliar disorder of Austrian pine observed in New Jersey since 1967 was found to result from a mixture of ozone and sulfur dioxide. In fumigation chamber studies, a mixture of 0.2 ppm ozone and 0.1 ppm sulfur dioxide for 6 hr reproduced symptoms observed in the field. Grafted material originating from trees that exhibited either a sensitive or resistant response in the field gave the same differential response in the experimental fumigation. Needles of resistant trees had higher stomatal resistance and higher soluble sugar content than needles of susceptible trees.