Abstract
Ponderosa pines in four study plots at medium elevations in the southern Sierra Nevada of California were evaluated for oxidant air pollution injury in relation to annual ring incremental growth, needle and branch growth, premature abscission rates of needles and relative leaf health. The average condition of disease was of moderate intensity. Hypersensitive ponderosa pine genotypes were identified and constitute between 7 and 10% of the trees. The oxidant injury index appeared to be a reasonable means of assessing air pollution impacts; but relative leaf health is an acceptable substitute to assess the intensity of oxidant-induced disease. The degree of defoliation correlated well with relative leaf health appears to be a good measure of air pollution injury. Bole annual growth, lateral branch and needle growth were not apparently associated with the oxidant injury index, but indications of a significant decrease in reserve energy are apparently due to defoliation and chlrosis caused by air pollution.
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