The synthesis of 4-nitroso-5-amminopyrazoles and of 4-nitroso-5-pyrazolylurethans and -ureas is described. The chemicals were tested for antifungal activity against Erysiphe graminis, Erysiphe cichoracearum, Puccinia recondita, Septoria apii and Rhizoctonia solani. A number of the described compounds showed some antifungal activity.
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