SUMMARY Germination of conidia of Diplocarpon rosae Wolf is inhibited in a solution made by dissolving 35 p.p.m. sulphur dioxide in water. Inhibition is permanent after exposure for 3 hr. Gaseous SO2 in air under controlled conditions at 100μg./m3 markedly reduces infection of rose leaves after exposure for 2 days. Blackspot of roses is checked or eliminated in areas where SO2 pollution of air exceeds 100/μ./m.3.
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P. J. W. Saunders (1966) studied this question.