Susceptibility of Healthy and Ozone-injured Needles of Pinus strobus to Invasion by Lophodermium pinastri and Aureobasidium pullulans1

Lophodermium pinastri and Aureobasidium pullulans were the fungi most often associated with foliar symptoms, including those caused by ozone, on Pinus strobus in the field. Following artificial inoculation of ozone-fumigated and untreated foliage on pine seedlings, L. pinastri was Isolated without relation to visible symptoms of ozone injury. A, pullulans was isolated only from tissues killed by ozone. No evidence of additive or interacting effects of ozone and the fungi was found.