Jeffrey pine

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 Jeffrey pine Courtesy, USDA PLANTS Database

Healthy Jeffrey pine Cone Courtesy, USDA PLANTS Database

Healthy Jeffrey pine Tree Courtesy, USDA PLANTS Database

Close-up View of Ozone Injury to Jeffrey pine Needles Courtesy, USDA Ozone Biomonitoring Program

Ozone Injury to Jeffrey pine Needles Courtesy, USDA Ozone Biomonitoring Program

Ozone Injury to Jeffrey pine Needles Courtesy, USDA Ozone Biomonitoring Program