title: Foliar injury in young Betula pendula roth., Salix purpurea L. and Ilex aquifolium L. trees and in propagated Taxus baccata L. shoots exposed to intermittent fog at a range of acidities.
abstract: The occurrence of various visible symptoms of foliar injury was assessed on a 5-point scale for each of the species. There was a distinct increase in the incidence of most types of injury in plant material which has been exposed to pH 2.5 acid fog. No clear pH-related trend in foliar injury occurred in plants exposed to acid fog at pH 3.5, pH 4.5 and pH 5.6, indicating that a threshold for a range of different types of visible injury may exist between pH 2.5 and pH 3.5 for all four species.
authors.affiliation: Institute of Environmental and Biological Sciences, University of Lancaster, Lancaster, Lancashire LA1 4YQ, UK.
authors.forename: M G
authors.initials: MG
authors.lastname: Barker
authors.forename: T W
authors.initials: TW
authors.lastname: Ashenden