Allegheny blackberry

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 Allegheny Blackberry Leaf Courtesy, Ozone Biomonitoring Program

Healthy Allegheny Blackberry Leaf Courtesy, Ozone Biomonitoring Program

Photo of Ozone Injured Allegheny Blackberry Courtesy, USDA Ozone Biomonitoring Program

Photo of Ozone Injured Allegheny Blackberry Courtesy, USDA Ozone Biomonitoring Program