Douglas' sagewort

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).

Douglas' sagewort Leaves Courtesy, Berkeley Digital Library Project

Douglas' sagewort Plant Courtesy, Natural Resources Conservation Service USDA

Douglas' sagewort Leaves Courtesy, California Lutheran University