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Whorled aster

Aster acuminatus

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).


photograph
Healthy Whorled aster Plant
Courtesy, Connecticut Botanical Society
photograph
Healthy Whorled aster Plant
Courtesy, Connecticut Botanical Society
updated on 09/17/2006  I   http://www.nature.nps.gov/air/Pubs/bioindicators/whorledAster.cfm   I  Email: Webmaster