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39959 
Journal Article 
Response of common milkweed to oxidant air pollution in the Shenandoah National Park in Virginia 
Duchelle, SF; Skelly, JM 
1981 
1 
Plant Disease
ISSN: 0191-2917 
65 
8 
661-663 
WOS:A1981MF32600009 
ABSTRACT Duchelle, S. F., and Skelly, J. M. 1981. Response of common milkweed to oxidant air pollution in the Shenandoah National Park in Virginia. Plant Disease 65:66l-663.
The effects of ambient doses of ozone on Asclepias syriaca, common milkweed, were determined in twelve l0-ft-diameter plots in the Big Meadows area of the Shenandoah National Park in Virginia. Chlorosis and purple stippling on the adaxial leaf surface were observed on milkweeds grown in ambient air chambers and open plots; those grown in charcoal-filtered air were asymptomatic and taller than those in other treatments. In the laboratory, ozone at 0.05, 0.10, and 0.15 ppm for 6hr/day for 7 days induced symptoms identical to those observed in the field.