Decline and Mortality of Smog-Injured Ponderosa Pine

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Over a 3-year period 36 trees in a 150-tree plot in the San Bernardino Mountains of Southern California were killed by the western pine or the mountain pine beetle. Thirty-three of these exhibited advanced disease symptoms caused by photochemical air pollution. Of the 114 trees still living, 85 showed an increase in disease symptoms. The average disease rating in the 3-year period almost doubled. We have concluded that should air pollution continue unabated, ponderosa pine will be virtually eliminated from the forest stands in this area.

Document Type: Journal Article

Affiliations: Assistant Plant Pathologist and Entomologist, in the Calif. Agr. Exp. Sta.

Publication date: March 1, 1970

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  • The Journal of Forestry is the most widely circulated scholarly forestry journal in the world. In print since 1902, the Journal has received several national awards for excellence. The mission of the Journal of Forestry is to advance the profession of forestry by keeping forest management professionals informed about significant developments and ideas in the many facets of forestry: economics, education and communication, entomology and pathology, fire, forest ecology, geospatial technologies, history, international forestry, measurements, policy, recreation, silviculture, social sciences, soils and hydrology, urban and community forestry, utilization and engineering, and wildlife management. The Journal is published bimonthly: January, March, May, July, September, and November.
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