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Speckled alder

Alnus rugosa

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 Speckled alder Leaves
Courtesy, Cofrin Center for Biodiversity, University of Wisconsin at Green Bay

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Healthy Speckled alder Berries
Courtesy, borealforest.org
photograph
Healthy Speckled alder
Courtesy, Cofrin Center for Biodiversity, University of Wisconsin at Green Bay

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