White snakeroot

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 White snakeroot Flower Courtesy, Wisconsin State Herbarium

Healthy White snakeroot Plant Courtesy, Wisconsin State Herbarium

Healthy White snakeroot Flowers Courtesy, Wisconsin State Herbarium