Abstract
Structure-activity relationships were studied on 25 analogs of 3-pyridylguanidines toward powdeiy mildew. Only the di-sec-alkyl analogs were active among the 1-alkyl or 1,1-dialkyl-2-(3-pyridyl)-3-p-ethoxyphenyIguanidines on available data. The activity was linearly correlated with Hammett’s σ constant of the substituents on the phenyl group, among which cyano, benzyloxy, alkoxy and diethylamino groups showed higher activity than chloro, nitro, methyl, bromo and phenyl groups. Fungitoxic spectrum and other fungicidal natures were also shown and compared with those of S–1358 and its derivatives.
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