RELATIONSHIP BETWEEN BRONZING IN WHITE BEANS AND PHYTOTOXIC LEVELS OF ATMOSPHERIC OZONE IN ONTARIO

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Abstract
Concentrations of ozone as high as 9 pphm (parts per hundred million) have been detected during mid-August in association with the incidence of the "bronzing" disorder of white beans (Phaseolus vulgaris) in southwestern Ontario. The disorder is characterized by the sudden appearance of a bronze-colored necrotic stipple of pods and the upper surface of the leaf, followed by chlorosis and abscission of both leaves and pods. Comparable symptoms were induced by treatment of bean plants with ozone at concentrations as low as 8 pphm for six hours, thereby implicating airborne oxidants as the probable cause of bronzing in white beans.
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