Crownbeard

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 Crownbeard Plant Courtesy, Institute for Systematic Botany

Healthy Crownbeard Plant Courtesy, Institute for Systematic Botany

Ozone Injury to Crownbeard Leaf Courtesy, Art Chappelka, Auburn University

Ozone Injury to Crownbeard Plant Courtesy, Art Chappelka, Auburn University