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Quaking aspen

Populus tremuloides

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 Quaking aspen Leaf
Courtesy, USDA PLANTS Database

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Ozone Injury to Quaking aspen Leaves
Courtesy, USDA PLANTS Database
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Ozone Injury to Quaking aspen Leaves
Courtesy, USDA PLANTS Database

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Ozone Injury to Quaking aspen Leaf
Courtesy, USDA PLANTS Database
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Healthy Quaking aspen Tree
Courtesy, USDA PLANTS Database

updated on 09/17/2006  I   http://www.nature.nps.gov/air/Pubs/bioindicators/quakingAspen.cfm   I  Email: Webmaster