European wine grape

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 European wine grape Leaves Courtesy, UW Madison Department of Botany

Ozone Injury to European wine grape Leaves Courtesy, LWF Ozone Injury Database

Ozone-injured European wine grape Leaf Courtesy, Dr. Don Davis, Pennsylvania State University

Ozone-injured European wine grape Courtesy, Dr. Don Davis, Pennsylvania State University