Quaking aspen

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 Quaking aspen Leaf Courtesy, USDA PLANTS Database

Ozone Injury to Quaking aspen Leaves Courtesy, USDA PLANTS Database

Ozone Injury to Quaking aspen Leaves Courtesy, USDA PLANTS Database

Ozone Injury to Quaking aspen Leaf Courtesy, USDA PLANTS Database

Healthy Quaking aspen Tree Courtesy, USDA PLANTS Database