Abstract
The effects of relatively low concentrations of SO 2 (less than 20 pphm) on the incidence and severity of bean rust and early blight of tomato were studied. Sulphur dioxide affected bean rust and early blight of tomato under the conditions used in these experiments. The effect of SO 2 on bean rust consisted of a decrease in the incidence and severity of the disease and in the size and percentage germination of uredospores. These effects resulted from exposure of plants to SO 2 before or after inoculation with the pathogen, but exposures before inoculation were more effective.
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