The investigations carried out in the Institute of Industrial Organic Chemistry on sulphur fungicides are discussed and some neu investigation possibilities are presented. Elementary sulphur - one of the oldest known fungicide is still being used in plant protection, mostly against powdery mildews in orchard, vegetables, ornamental and cereal crops. Because it is of low toxicity to mammals and aqueous organisms, and does not disturbance the environment it is now respected as one of the "ecological fungicide". In contrasts to the modern, highly selective, systemic fungicides sulphur does not provoke the resistance building in plant pathogenic fungi, what is profitable in its usage as component of fungicidal mixtures.
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