Pacific 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 Pacific ninebark Leaf Courtesy, USDA Ozone Biomonitoring Program

Ozone Injury to Pacific ninebark Leaf Courtesy, USDA Ozone Biomonitoring Program

Pacific ninebark Leaf with Ozone Injury Courtesy, USDA Ozone Biomonitoring Program

Ozone Injury to Pacific ninebark Leaf Courtesy, USDA Ozone Biomonitoring Program

Healthy Pacific ninebark Plant Courtesy, USDA PLANTS Database