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The cis-and traps-isomers of 1-(4-chlorophenyl)-2-(1 H-1, 2, 4-triazol-l-yl) cycloheptanol (1, 2) were compared in antifungal and plant growth-inhibitory activities. The cis-isomer of triazolylcycloheptanol had stronger antifungal activity against most fungi than the transisomer in vitro. Against Rosellinia nacatrix, however, the traps-isomer showed much stronger antifungal activity than the cis-isomer. In preventive activity against cucumber gray mold, powdery mildew, sclerotinia rot and rice blast, the cis-isomer was much stronger than the traps-isomer. In disease-controlling activity against wheat powdery mildew and oat crown rust, the cis-isomer was slightly stronger than the traps-isomer, whereas against rice sheath blight both isomers were similarly active. On the other hand, the traps-isomer had much stronger inhibitory activity than the cis-isomer on the growth of rice seedlings. Diastereomers of 1-substituted-2-(1 H-1, 2, 4-triazol-l-yl) cyclohexanols (3-8) were also compared in biological activity. In disease-controlling activity the cis-isomers were more effective than the corresponding traps-isomers against cucumber gray mold and powdery mildew. In plant growth inhibitory activity the traps-isomers were more effective than the cis-isomers on rice seedlings. Between the two enantiomers of cis-1-(4-chlorophenyl)-2-(1 H-1, 2, 4-triazol-1-yl)cycloheptanol (1), the preventive activity of the (l)-enantiomer was about two times stronger than that of the (d)-enantiomer against cucumber gray mold and powdery mildew. The (l)-enantiomer also had stronger growth inhibitory activity on rice seedlings than the (d)-enantiomer.