American hazelnut

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).

Close-up View of American hazelnut Flowers Courtesy, University of Connecticut American hazelnut Leaves Courtesy, Wisconsin State Herbarium Vascular Plant Species Database American hazelnut Leaf Courtesy, University of Connecticut

American hazelnut Branch with Ozone Injury Courtesy, University of Connecticut