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Thornless blackberry

Rubus canadensis

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 Thornless blackberry Berries
Courtesy, USDA PLANTS Database

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Healthy Thornless blackberry Flower
Courtesy, USDA PLANTS Database
updated on 09/19/2006  I   http://www.nature.nps.gov/air/Pubs/bioindicators/thornlessBlackberry.cfm   I  Email: Webmaster