Effects of Sulfur Dioxide on Expansion of Lesions Caused byCorynebacterium nebraskensein Maize and byXanthomonas phaseolivar.sojensisin Soybean

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Abstract
The effects of air pollution on plant disease development were assessed. Maize or soybean plants were exposed to SO2 at 524 .mu.g m-3 or 262 .mu.g m-3 before, after, or before and after inoculation with C. nebraskense or X. phaseoli var. sojensis, respectively. Lesion development was inhibited in both cases, regardless of when the exposures occurred. The time of exposure altered the subsequent effect on lesion size. Dry weight and S content of host tissue were not altered by the joint effects of the pollutant and the pathogens.