Populus x euramericana cultivars Dorskamp and Zeeland were exposed to 81 ..mu..g O/sub 3//m/sup 3/ (0.041 ppm) for 12 hr/day from 5 May to 13 October 1977 in controlled, plastic fumigation chambers in a greenhouse. The fumigation induced severe premature defoliation (about 60%), slight reduction in stem dry matter production (4-12%), and no reduction in stem elongation, compared with unexposed control plants. Foliar symptoms began to appear about 10 days after the fumigation began.
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J. C. Mooi (1980) studied this question.