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Home → Publications → Seed and Seedling Diseases in the Western US → Interactions Between Photochemical Air Pollution and Heterobasidion Annosum in a Mixed Conifer Forest Ecosystem

Interactions Between Photochemical Air Pollution and Heterobasidion Annosum in a Mixed Conifer Forest Ecosystem

Within the mixed conifer forest ecosystem of the San Bernardino Mountains in southern California, photochemical air pollution significantly affects the epidemiology of the root pathogen Heterobasidion annosum. Most aspects of the disease cycle of tl. annosum in ponderosa and Jeffrey pine are enhanced by oxidant pollution. An analytical model, prepared using data from several experimental studies, predicts that tree losses from annosum root disease are 6.5 times greater in stands severely injured by air pollution as compared with stands only moderately or slightly injured. The proposed model requires validation under natural forest conditions.


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Author(s): USDA Forest Service