White ash

Ozone injury usually appears as black or purple spots (stipple), yellow or white bleached spots (chlorotic mottle, needle tip burn), or leaf browning (necrosis). Ozone may also cause premature leaf drop (senescence).

Healthy White ash Courtesy, USDA Ozone Biomonitoring Program

Healthy White ash Courtesy, Virginia Tech Forestry Department

Ozone Injury to White ash Leaves Courtesy, USDA Ozone Biomonitoring Program

Ozone Injury to White ash Leaves Courtesy, USDA Ozone Biomonitoring Program