Occurrence and severity of foliar ozone symptoms on sensitive hardwood species in Shenandoah National Park, VA
- Pennsylvania State Univ., University Park (United States)
To assess the extent of foliar symptoms due to ozone on sensitive hardwoods in the Shenandoah National Park in Virginia, three species were sampled and evaluated at sites of differing elevations adjacent to 3 ozone monitors in 1991 and 1992: black cherry, yellow poplar, and white ash. All foliar samples were evaluated to precent of symptomatic leaves on each branch and average precent leaf area affected. The Horsfall-Barratt rating scale was used to estimate the precent leaf area symptomatic. Ozone symptoms were manifested as stipple on the adazial leaf surface. In the preliminary 1991 sampling, 40, 87, and 7% of black cherry trees sampled were found to be symptomatic at the 3 sites; 63 and 67% of yellow poplar trees sampled were found to be symptomatic at sites 1 and 3, as were 43 and 63% of the white ash at sites 1 and 2 (3 complete sets were not found in 1991). In 1992, the sampling and rating of injury were repeated. Symptoms of ozone injury appeared on 23, 88, and 10% of black cherry, on 17, 7, and 80% of yellow poplar, and 27, 40, and 40% of white ash. Elevation and ozone exposure will be discussed.
- OSTI ID:
- 6444869
- Report Number(s):
- CONF-9210386-; CODEN: PHYTAJ
- Journal Information:
- Phytopathology (An International Journal); (United States), Vol. 83:2; Conference: American Phytopathological Society Northeastern Division meeting, Portland, ME (United States), 28-30 Oct 1992; ISSN 0031-949X
- Country of Publication:
- United States
- Language:
- English
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