Spreading dogbane
Apocynum androsaemifoliumOzone 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 Spreading dogbane Leaves
Courtesy, USDA Ozone Biomonitoring Program |
 Healthy Spreading dogbane Leaves
Courtesy, USDA Ozone Biomonitoring Program |
 Ozone Injury to Spreading dogbane Leaf
Courtesy, Dr. Don Davis Pennsylvania State University |
 Close-up View of Ozone Injury to Spreading dogbane Leaf
Courtesy, USDA Ozone Biomonitoring Program |
 Ozone Injury to Spreading dogbane Leaves
Courtesy, USDA Ozone Biomonitoring Program |
 Ozone Injury to Spreading dogbane Leaves
Courtesy, USDA Ozone Biomonitoring Program |