Tree-of-heaven

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 Tree-of-heaven Leaves Courtesy, Virginia Tech Forestry Department

Healthy Tree-of-heaven Leaves Courtesy, Virginia Tech Forestry Department

Ozone Injury to Tree-of-heaven Leaf Courtesy, Dr. Don Davis Pennsylvania State University

Ozone Injury to Tree-of-heaven Leaves LWF Ozone Injury Databank