Thornless 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 Thornless blackberry Berries Courtesy, USDA PLANTS Database

Healthy Thornless blackberry Flower Courtesy, USDA PLANTS Database