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Red alder

Alnus rubra

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 Red alder
Courtesy, Oregon State University Department of Horticulture

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Ozone Injury to Red alder Leaf
Courtesy, USDA Ozone Biomonitoring Program
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Ozone Injury to Red alder Leaves
Courtesy, USDA Ozone Biomonitoring Program

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Close-up View of Ozone Injury to Red alder Leaf
Courtesy, USDA Ozone Biomonitoring Program
updated on 09/17/2006  I   http://www.nature.nps.gov/air/Pubs/bioindicators/redAlder.cfm   I  Email: Webmaster