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White ash

Fraxinus americana

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).


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Healthy White ash
Courtesy, USDA Ozone Biomonitoring Program
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Healthy White ash
Courtesy, Virginia Tech Forestry Department

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Ozone Injury to White ash Leaves
Courtesy, USDA Ozone Biomonitoring Program
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Ozone Injury to White ash Leaves
Courtesy, USDA Ozone Biomonitoring Program
updated on 09/17/2006  I   http://www.nature.nps.gov/air/Pubs/bioindicators/whiteAsh.cfm   I  Email: Webmaster