Standardized procedures for establishing plots and evaluating pollution injury to common milkweed in the eastern United States
Coupland AJ and Bennett JP. 1984. Standardized procedures for establishing plots and evaluating pollution injury to common milkweed in the eastern United States
This study sought to employ standardized methods for determining the geographic extent of air pollution (ozone injury) on common milkweed (Asclepias syriaca) in the eastern United States and to determine relative severity of ozone injury on this species among National Park Service units during the 1984 air pollution season