Abstract
Visible foliar injury on plants of Pisum sativum was observed at Ascot in early June 1978. The symptoms resembled those produced by exposure to high concentrations of ozone. Comparisons between plants growing in filtered and unfiltered air and between cultivars differing in ozone sensitivity supported the hypothesis that elevated concentrations of ozone had caused this injury. At the same time, cotyledons of Raphanus sativus plants showed an accelerated rate of senesence. This is the first time that visible leaf injury of commercial crop species has been recorded in the United Kingdom, although records of ozone concentrations for previous years suggest that such damage may have occurred in the past.
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