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Crownbeard

Verbesina occidentalis

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 Crownbeard Plant
Courtesy, Institute for Systematic Botany
photograph
Healthy Crownbeard Plant
Courtesy, Institute for Systematic Botany

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Ozone Injury to Crownbeard Leaf
Courtesy, Art Chappelka, Auburn University
photograph
Ozone Injury to Crownbeard Plant
Courtesy, Art Chappelka, Auburn University
updated on 09/17/2006  I   http://www.nature.nps.gov/air/Pubs/bioindicators/crownbeard.cfm   I  Email: Webmaster