Received for publication April 11, 1978. Contribution No. 937 from the Department of Plant Pathology, Paper No. 5245 in the Journal Series of the Pennsylvania Agricultural Experiment Station, and Contribution No. 460-77 of the Center for Air Environment Studies, the Pennsylvania State University Park, PA 16802. Funds provided by the U.S. Environmental Protection Agency Grant No. T 900537. Space provided by the School of Forest Resources.
The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper must therefore be hereby marked advertisement solely to indicate this fact.
Former Graduate student and Associate Professor, Department of Plant Pathology and Center for Air Environment Studies. Current address of the senior author: Argonne National Laboratroy Argonne, ILL 60439.
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