Mallow ninebark

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 Mallow ninebark Flowers Courtesy, Washington State University

Healthy Mallow ninebark Flowers Courtesy, Virginia Tech Forestry Department

Ozone Injury to Mallow ninebark Courtesy, LWF Ozone Injury Databank

Ozone Injury to Mallow ninebark Courtesy, LWF Ozone Injury Databank